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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 177-180 
    ISSN: 0044-2313
    Keywords: Oxomanganate(VI), Rb2[MnO4] ; preparation ; crystal structure ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A ‘Reductive Exchange Reaction’: Single Crystals of Rb2[MnO4] from Li[MnO4]By heating of well ground mixtures of the oxides RbO0.9 and Li[MnO4] (Rb:Mn = 1.5:1; Ag-tubes; 660°C, 56 d) dark-green, orthorhombic single-crystals of Rb2[MnO4] were obtained. The structural determination revealed the isotype to K2[MnO4]; a β-K2SO4-typ. Thus, for the first time by a pure solid-state-chemical way, via a reductive, complete alkali-metal exchange, single crystals of an oxomanganate(VI) of the alkali metals were prepared.The Madelung Part of the Lattice Energy, MAPLE, and the charge distribution were calculated.
    Notes: Durch Tempern inniger Gemenge der Oxide RbO0,9 und Li[MnO4] (Rb:Mn = 1,5:1; Ag-Zylinder; 660°C, 56 d) wurden dunkelgrüne, orthorhombische Einkristalle von Rb2[MnO4] erhalten. Die Einkristallstrukturbestimmung belegt die Isotypie zu K2[MnO4]; es liegt der β-K2SO4-Typ vor. Somit konnten erstmals auf rein festkörperchemischem Weg, über einen reduktiven, vollständigen Alkalimetall-Austausch, Einkristalle eines Oxomanganates(VI) der Alkalimetalle dargestellt werden.Der Madelung-Anteil der Gitterenergie, MAPLE, sowie die Ladungsverteilung wurden berechnet.
    Additional Material: 6 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 618 (1992), S. 60-63 
    ISSN: 0044-2313
    Keywords: Litho-Manganate(V), Cs2{Li[MnO4]} ; preparation ; single crystal structure ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First “Litho-Manganate(V)” with Layer-Structure: Cs2{Li[MnO4]}By heating intimate mixtures of the oxides [CsO1,2, Li2MnO3; Cs: Mn = 2,3 : 1; Ag-Zylinder, 580°C, 62 d] blue-green single crystals of Cs2{Li[VO4]} were obtained for the first time. The new “Litho-Manganate(V)” crystallices orthorhombic (SG: Cmc21) with a = 596.08(7), b = 1202.6(1), c = 816.8(1) pm (Guinier-Simon data), Z = 4. It is isotypic with Cs2{Li[VO4]} [1].The structure was determined by four-circle-diffractometer data [Mo—Kα, for 496Io(hkl) R = 3.1%, R, = 2.4%], parameters see text.The Madelung Part of Lattice Energie, MAPLE and Effective Coordination Numbers, ECoN, these calculated via Mean Fictive Ionic Radii, MEFIR, are calculated and disscussed.
    Notes: Erstmals wurde Cs2{Li[MnO4]} beim Tempern inniger Gemenge der Oxide [CsO1,2, Li2MnO3; Cs: Mn = 2,3 : 1; Ag-Zylinder, 580°C, 62d] in Form blaugrüner Einkristalle erhalten. Das neue “Litho-Manganat(V)” kristallisiert orthorhombisch (RG: Cmc21) mit a = 596,08(7), b = 1202,6(1), c = 816,8(1) pm (Guinier-Simon-Daten), Z = 4. Es ist isotyp zu Cs2{Li[VO4]} [1].Die Strukturaufklärung erfolgte mittels Vierkreisdiffraktometerdaten [Mo—Kα, für 496 Io(hkl) R = 3,1%, Rw = 2,4%], Parameter siehe Text.Der Madelunganteil der Gitterenergie, MAPLE und die Effektiven Koordinationszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR, werden berechnet und diskutiert.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1419-1425 
    ISSN: 0044-2313
    Keywords: Lithium permanganate, Li[MnO4] ; preparation ; crystal structure ; neutron powder data ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coordination Number 4 or 6 for Lithium?: The Crystal Structure of Lithium Permanganate, Li[MnO4]Waterless 7Li[MnO4] was obtained by dehydration of 7Li[MnO4] · 3 D2O at 60°C above P4O10 in vacuum as violet powder.The structure determination by neutron diffraction measurements via pulsed polychromatic neutron source [time-of-flight powder diffractometer; profile-R-value = 2.1%, Bragg-R-value = 7.4%] confirms the space group Cmcm with a = 551.402(8), b = 839.754(15), c = 635.911(10) pm (Z = 4); parameters see text. The crystal structure of Li[MnO4] corresponds to the CrVO4-type with coordination number 6 for lithium and 4 for manganese.The Madelung Part of Lattice Energie, MAPLE, the Effective Coordination Numbers, ECoN and the charge distribution were calculated and discussed.
    Notes: Durch Trocknung von 7Li[MnO4] · 3 D2O bei 60°C über P4O10 im Vakuum wurde wasserfreies 7Li[MnO4] als violettes Pulver erhalten.Die Strukturaufklärung mittels Neutronenbeugungsmessungen im gepulsten polychromatischen Neutronenstrahl [Flugzeitdiffraktometer; Profil-R-Wert = 2,1%, Bragg-R-Wert = 7,4%] belegt die Raumgruppe Cmcm mit a = 551,402(8), b = 839,754(15), c = 635,911(10)pm (Z = 4); Parameter siehe Text. Die Kristallstruktur von Li[MnO4] entspricht dem CrVO4-Typ mit der Koordinationszahl 6 für Lithium und 4 für Mangan.Der Madelunganteil der Gitterenergie, MAPLE, Effektive Koordinationszahlen, ECoN und die Ladungsverteilung wurden berechnet und diskutiert.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 617 (1992), S. 45-52 
    ISSN: 0044-2313
    Keywords: Ba3NaNbO6 ; Ba3NaTaO6 ; single crystals ; crystal structure ; MAPLE calculation ; charge distribution ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxometallates of a new Type: On Ba3NaNbO6 and Ba3NaTaO6For the first time in form of colourless, transparent single crystals of Ba3NaNbO6 [annealed mixtures of BaO, Na2O and Nb2O5, Ba : Na : Nb = 3.3 : 1.1 : 1, Ni-cylinder, 1100°C, 3d] as well as Ba3NaTaO6 [annealed mixtures of BaO, Na2O and Ta2O5, Ba : Na : Ta = 3.3 : 1.1 : 1, Ni-cylinder, 1100°C, 3d] have been prepared.The crystal structure was solved by fourcycle-diffractometer data [Ba3NaNbO6: Mo—Kα, 356 out 356 I0 (hkl), space group R3c with a = 1026.6(1)pm, c = 1195.3(2)pm (Guinier-Simon powder data), Z = 6, R = 2.4%, Rw = 2.0% and Ba3NaTaO6: Ag—Kα, 498 out of 498 I0 (hkl), space group R3c with a = 1027.6(1)pm, c = 1196.0(2)pm (Guinier-Simon powder data), Z = 6, R = 4.9%, Rw = 4.4%], parameters see text.The Ba3M part of structure (M = Nb, Ta) corresponds to a slightly (hexagonal) deformed Nb3Al arrangement with Na inserted along [001] between adjacent Mv, which are nearly perfectly octahedrally surrounded by 6 O.The structural relations are deduced by Schlegel Diagrams. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, the latter derived from Mean Effective Ionic Radii, MEFIR, as well as Charge Distribution, CHARDI, are calculated.
    Notes: Erstmals wurde in Form farbloser, transparenter Einkristalle Ba3NaNbO6 [aus innigen Gemengen von BaO, Na2O und Nb2O5, Einwaage vor dem Verreiben: Ba : Na : Nb = 3,3 : 1,1 : 1, Ni-Zylinder, 1100°C, 3d] sowie Ba3NaTaO6 [aus Gemengen von BaO, Na2O und Ta2O5, Ba : Na : Ta = 3,3 : 1,1 : 1, Ni-Zylinder, 1100°C, 3d] dargestellt.Die Kristallstruktur wurde mittels Vierkreisdiffraktometerdaten [Ba3NaNbO6: Mo—Kα, 356 von 356 I0 (hkl), Raumgruppe R3c mit a = 1026,6(1)pm, c = 1195,3(2)pm (Guinier-Simon-Pulverdaten), Z = 6, R = 2,4%, Rw = 2,0% bzw. Ba3NaTaO6: Ag—Kα, 498 von 498 I0 (hkl), Raumgruppe R3c mit a = 1027,6(1)pm, c = 1196,0(2)pm (Guinier-Simon-Pulverdaten), Z = 6, R = 4,9%, Rw = 4,4%] aufgeklärt, Parameter siehe Text.Dem Ba3M-Teil beider Oxide (M = Nb, Ta) liegt eine leicht (hexagonal) verzerrte Variante des Nb3Al-Typs zugrunde. Na besetzt entlang [001] Positionen zwischen benachbarten, fast exakt oktaedrisch von 6 O2- koordinierten Mv.Die strukturellen Zusammenhänge werden aus den Schlegel-Diagrammen abgeleitet. Der Madelunganteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR, sowie die Ladungsverteilung ‚CHARDI‘ wurden berechnet.
    Additional Material: 5 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1647-1654 
    ISSN: 0044-2313
    Keywords: Oxoiridate(IV) ; square planar groups ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Oxoiridates(IV) with Square-planar Groups [IrO4]4-: Na4IrO4, a Substitution-variant of MgO with Ordered Vacancies in the Anionic Part of Structure.For the first time we prepared transparent red single crystals of Na4[IrO4] by an “exchange reaction” (Li2IrO3 + 2.20 Na2O; Ag, 800°C, 71 days): tetragonal, space group I4/m (No. 87), a = 716.70(4) pm and c = 471.32(4) pm; Z = 2.The structure determination via four circle diffractometer data (Mo—Kα, graphite; 2 138 I0(hkl), R = 0.0179; Rw = 0.0184) was carried out with all 296 independent reflexions.Therefore Na4IrO4 crystallizes in a defect-variant of MgO which can be derived from Na4UO5. Ir4+ is surrounded square-like by four O2- with two vacancies completing the octahedron.The Madelung Part of Lattice Energy, MAPLE, Effective Coordination Numbers, ECoN, these via Mean Fictive Ionic Radii, MEFIR, are calculated and discussed. Furthermore the mean value for MAPLE(“IrO2”) of all alkaline- and alkaline-earth-oxoiridates(IV) is given.
    Notes: Erstmals erhielten wir über eine Austauschreaktion (Li2IrO3 + 2,20 Na2O; Ag, 800°C, 71 Tage) transparente, rote Einkristalle von Na4IrO4: tetragonal, Raumgruppe I4/m (Nr. 87), a = 716,70(4) pm und c = 471,32(4) pm, Z = 2.Die Struktur wurde mittels Vierkreisdiffraktometerdaten (Mo—Kα, Graphit; 2 138 I0(hkl), R = 0,0179; Rw = 0,0184) unter Verwendung aller 296 symmetrie-unabhängiger Reflexe bestimmt. Na4IrO4 kristallisiert demnach in einer MgO-Defektvariante, die sich vom Na4UO5-Typ ableitet. Ir4+ ist quadratisch-planar von vier O2- umgeben; zwei „Lücken“ ergänzen zum elongierten Oktaeder.Der Madelunganteil der Gitterenergie, MAPLE, Effektive Koordinationszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR, werden berechnet und diskutiert. Darüber hinaus wird der Mittelwert für MAPLE(“IrO2”) aller Alkali- und Erdalkalioxoiridate(IV) angegeben.
    Additional Material: 6 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 225-233 
    ISSN: 0044-2313
    Keywords: Oxoiridates ; [IrO4]4- groups ; crystal structure ; magnetic measurements ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Type of Structure in Oxoiridates with Square-planar Groups [IrO4]4-: K2Na2[IrO4], a Network ∞3[Na2IrO4] with Channels (With a Remark on Rb2Na2[IrO4])For the first time magnificent dark red cuboid single crystals of K2Na2[IrO4] were prepared by annealing intimate mixtures of a) KO0.51, Na2O2, IrO2 and Ir-powder (molar proportions 3.02 : 1.40 : 1.00 : 1.00; Ag-bomb, 740°C, 54 d) and of b) KO0.51, Na2O and IrO2 (molar proportions K : Na : Ir = 2.20 : 2.20 : 1.00; Ag-bomb, 760°C, 57 d) respectively. The oxide crystallizes mP36, space group P21/c with a = 600.35(6) pm, b = 1111.2(1) pm, c = 933.0(1) pm and β = 113.14(1)°.Structure determination via four-circle diffractometer data (Siemens AED 2, Mo-Kα-Radiation) for all 2347 unique reflexions (merged from 9397 Io(hkl) gave R = 0.0357 and Rw = 0.0340. K2Na2[IrO4] crystallizes in a new type of structure. The oxide is antiferromagnetic as magnetic measurements showed (TN = 32 K, Θ = -60.2 K (single crystals) and -49.2 K (powder) respectively, μ = 3.06 μB (single crystals) and 2.93 μB (powder) respectively).Effective coordination numbers ECoN, mean fictive ionic radii MEFIR and the Madelung part lattice energy MAPLE as well as the charge distributions CHARDI and CHARDINO are calculated and discussed.
    Notes: Erstmals wurde K2Na2[IrO4] durch Tempern inniger Gemenge von (a) KO0,51, Na2O2, IrO2 und Ir-Pulver (molares Verhältnis 3,02 : 1,40 : 1,00 : 1,00; Ag-Bombe, 740°C, 54 d) bzw. (b) KO0,51, Na2O und IrO2 (molares Verhältnis K : Na : Ir = 2,20 : 2,20 : 1,00; Ag-Bombe, 760°C, 57 (d) in Form prächtiger, dunkelroter, quaderförmiger Einkristalle erhalten. Das Oxid kristallisiert in P36, Raumgruppe P21/c mit a = 600,35(6) pm; b = 1111,2(1) pm; c = 933,0(1) pm und β = 113,14(1)°. Die Struktur wurde anhand von Vierkreisdiffraktometerdaten aufgeklärt (Siemens AED 2, Mo-Kα-Strahlung, Graphit). Für alle 2347 symmetrieunabhängigen Reflexe (gemittelt aus 9397 gemessenen Io(hkl)) war schließlich R = 0,0357 und Rw = 0,0340. K2Na2[IrO4] kristallisiert in einem neuen Strukturtyp. Magnetische Messungen zeigten, daß das Oxid antiferromagnetisch ist (TN = 32 K, Θ = -60,2K (Einkristalle) bzw. -49,2K (Pulver); μ = 3,06 μB (Einkristalle) bzw. 2,93 μB (Pulver)).Effektive Koordinationszahlen ECoN, Mittlere Fiktive Ionenradien MEFIR und der Madelunganteil der Gitterenergie MAPLE sowie die Ladungsverteilungen nach CHARDI und CHARDINO werden berechnet und diskutiert.
    Additional Material: 8 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 605 (1991), S. 43-50 
    ISSN: 0044-2313
    Keywords: Cesium lithium orthogermanate ; preparation ; crystal structure ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: About Cs2Li2[GeO4]By heating of a well-ground mixture of the binary oxides CsO0.55, Li2O and GeO2 (Cs:Li:Ge=2,6:2,2:1; Ni-tube; 600 °C; 49d) we got single crystals of Cs2Li2[GeO4] for the first time. Cs2Li2[GeO4] is isotypic to Rb2Li2[MO4] [M = Si, Ti, Ge] [2] and Cs2Li2[MO4] (M = Si, Ti) [3]: according to this Cs2Li2[GeO4] crystallizes triclinic, in the spacegroup P1 with a = 968.7(4) pm, b = 586.0(2) pm, c = 571.4(2) pm, α = 92.71(4)°, β = 110.95(3)° and γ = 94.34(4)° (Guinier-Simon data), Z = 2. The structure was determined by four-circle diffractometer data (Ag—Kα; 2381 Io(hkl); R = 8,4%; Rw = 5.0%), parameters see text. Further the Madelung Part of Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN) and the Mean Fictive Ionic Radii (MEFIR), have been calculated.
    Notes: Durch Tempern inniger Gemenge der binären Oxide CsO0,55, Li2O und GeO2 (Cs:Li:Ge = 2,6:2,2:1; Ni-Bömbchen; 600°C; 49d) wurden erstmals Kristalle von Cs2Li2[GeO4] erhalten. Cs2Li2[GeO4] ist zu Rb2Li2[MO4] (M = Si, Ti, Ge) [2] und Cs2Li2[MO4] (M = Si, Ti) [3] isotyp; hiernach kristallisiert Cs2Li2[GeO4] triklin, in der Raumgruppe P1 mit a = 968,7(4) pm, b = 586,0(2) pm, c = 571,4(2) pm, α = 92,71(4)°, β = 110,95(3)° und γ = 94,34(4)° (Guinier-Simon Daten), Z = 2. Die Struktur wurde mittels Vierkreisdiffraktometer (Ag-Kα; 2381 I0(h k l); R = 8,4%; Rw = 5,0%) bestimmt, Parameter siehe Text. Weiterhin wurden der Madelunganteil der Gitterenergie (MAPLE), Effektive Koordinationszahlen (ECoN) und die Mittleren Fiktiven Ionenradien (MEFIR) berechnet.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 605 (1991), S. 25-34 
    ISSN: 0044-2313
    Keywords: Alkali metal orthoborate, Cs3NA{Li2[BO3]2} ; preparation ; crystal structure ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First Quinquinary Orthoborate of the Alkali Metals: Cs3Na{Li2[BO3]2}For the first time Cs3NaLi2B2O6 was obtained by ‘exchange reaction’ from an intimate mixture of NaLi2[BO3] and Cs2O (Cs:B = 2:1) in the form of colourless lamellar single crystals. The structure determination (four-circle diffractometer AED 2, MoKα, 3213 Io(hkl), R = 6.3%, Rw = 4.9%) confirms the space group P1;a = 1026.7(7) pm, b = 733.4(4) pm, c = 673.3(5) pm, α = 103.92(5)°, α = 101.41(6)°, β = 96.68(5)°; Z = 2.The characteristic structure units are chains ∞11{Li2B2O6} consisting of approximately trigonal planar [BO3] groups and distorted [LiO4] tetrahedra.Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR) and the Madelung Part of Lattice Energy (MAPLE) are calculated.
    Notes: Erstmals wurde Cs3NaLi2B2O6 durch ‚Austauschreaktion‘ aus einem Gemenge von NaLi2[BO3] und Cs2O (Cs:B = 2:1) in Form von farblosen, plättchenförmigen Einkristallen erhalten. Die Strukturaufklärung (Vierkreisdiffraktometer AED 2, MoKα, 3213 I0(h k l), R = 6,3%, Rw = 4,9%) bestätigt die Raumgruppe P1; a = 1026,7(7) pm, b = 733,4(4) pm, c = 673,3(5) pm, α = 103,92(5)°, β = 101,41(6)°, γ = 96,68(5)°; Z = 2.Charakteristische Strukturelemente sind Ketten ∞1{Li2B2O6} aus annähernd trigonal planaren [BO3]-Gruppen und verzerrten [LiO4]-Tetraedern.Effektive Koordinationszahlen (ECoN), Mittlere Fiktive Ionenradien (MEFIR) und der Madelunganteil der Gitterenergie (MAPLE) werden berechnet.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 605 (1991), S. 67-74 
    ISSN: 0044-2313
    Keywords: Alkali metal orthoarsenate, Cs2Na[AsO4] ; crystal structure ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First Quaternary Alkalioxoarsenate (V): Cs2Na[AsO4]By heating of well-ground mixtures of the binary oxides (“Cs2O”, Na2O2, As2O3; Cs:Na:As = 2:1:1; Ni-tube, 500 °C, 21d) bright, colourless single crystals were obtained for the first time. The new arsenate crystallices monoclinic (space group P21/m) with a = 827,5(2), b = 615,7(2), c = 605,6(2) pm, β = 91,98(2)° (Guinier-Simon powder data), Z = 2. It is isotypic with Cs2Na[VO4] [2]. The structure was determined by four-circle-diffractometer data [Siemens AED II, MoKα, 1155 Io (hk1), R = 5.1%, Rw = 4.4%, parameters see text]. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these calculated via Mean Fictive Ionic Radii, MEFIR, are calculated and discussed.
    Notes: Erstmals wurde Cs2Na[AsO4] beim Tempern inniger Gemenge der binären Oxide („Cs2O“, Na2O2, As2O3; Cs: Na : As = 2:1:1; Ni-Bombe, 500° C, 21 d) in Form prachtvoller, farbloser Einkristalle erhalten. Das neue Orthoarsenat(V) kristallisiert monoklin (Raumgruppe P21/m) mit a = 827,5(2), b = 615,7(2), c = 605,6(2) pm, β = 91,98(2)° (Guinier-Simon-Pulverdaten), Z = 2, Es ist isotyp mit Cs2Na[VO4][2]. Die Struktur wurde mittels Vierkreisdiffraktometerdaten [Siemens AED II, MoKα, 1151 Io (hkl), R = 5,1%, Rw = 4,4%, Parameter siehe Text]; aufgeklärt. Der Madelunganteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, diese über Mittlere Fiktive Ionenradien, MEFIR, werden berechnet und diskutiert.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 611 (1992), S. 73-80 
    ISSN: 0044-2313
    Keywords: Potassium, sodium gallate ; preparation ; crystal structure ; MAPLE calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of KGaO2 and NaGaO2(II)By annealing intimate mixtures of K2O, Na2O and β-Ga2O3 (K : Na : Ga = 2.2 : 1.1 : 1) we obtained single crystals of K2Na4[(GaO3)2] and KGaO2 (Ag-cylinder; 600°C, 26 d). Structure refinement for KGaO2 (four-circle diffractometer data, Mo-Kα, 1 390 or 1 390 Io(hkl); R = 5.55%, Rw = 3.05%) confirms the space group Pbca; a = 552.1 pm, b = 1 107.5 pm, c = 1 580.7 pm, Z = 16.According to K[GaO4/2] we have a stuffed cristobalite-related structure.Single crystals of NaGaO2(II) were grown by annealing intimate mixtures of Na2O2 and GaAs (Na2O2 : GaAs 4.1 : 1) in Ag-cylinders that were not completely closed (570°C, 6 weeks). Structure refinement for NaGaO2(II) (four-circle diffractometer data, Mo-Kα, 588 of 616 Io(hkl); R = 4.54%, Rw = 4.06%) confirms the spacegroup Pna21; a = 549.8(1) pm, b = 720.6(1) pm, c = 529.8(1) pm, Z = 4. In NaGaO2(II) we have a wurtzite-related structure.
    Notes: Beim Tempern inniger Gemenge von K2O, Na2O und β-Ga2O3 (vor Verreiben: K : Na : Ga = 2,2 : 1,1 : 1) erhielten wir neben Einkristallen von K2Na4[(GaO3)2] auch solche von KGaO2 (Ag-Zylinder, 600°C, 26 d). Die Strukturverfeinerung (Vierkreisdiffraktometerdaten, Mo-Kα, 1 390 von 1 390 Io(hkl); R = 5,55%, Rw = 3,05%) belegt die Raumgruppe Pbca; a = 552,1 pm, b = 1 107,5 pm, c = 1 580,7 pm, Z = 16.Es liegt eine aufgefüllte Cristobalit-Variante gemäß K[GaO4/2] vor.Einkristalle von NaGaO2(II) erhielten wir durch Tempern inniger Gemenge von Na2O2 und GaAs (vor Verreiben: Na2O2: GaAs 4,1 : 1) in nicht ganz verschlossenen Ag-Zylindern (570°C, 6 Wochen). Die Strukturverfeinerung (Vierkreisdiffraktometerdaten, Mo-Kα, 588 von 616 Io(hkl); R = 4,54%, Rw = 4,06%) belegt die Raumgruppe Pna21; a = 549,8(1) pm, b = 720,6(1) pm, c = 529,8(1) pm, Z = 4 (Guinier-de Wolff-Daten). NaGaO2(II) ist eine Ordnungsvariante des Wurtzit-Typs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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