Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1985-1989  (10)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 570 (1989), S. 133-137 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Transmission Electronmicroscopical Investigation of ZnNb14O35F2ZnNb14O35F2 was prepared by heating the mixture ZnF2/Nb2O5 = 1 : 7. The high resolution transmission electronmicroscopical pictures show, that a block structure of monoclinic arranged, edge sharing [3 × 5] blocks exists, which is already known from MgNb14O35F2. The investigated crystal areas have only few defects. The data for the unit cell result from the evaluation of the Guinier diagram: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm a} = 20.68,{\rm b} = 3.83,{\rm c} = 19.24{\AA},{\rm \beta } = 108.35\deg. $$\end{document}.
    Notes: ZnNb14O35F2 wurde durch Erhitzen des Gemenges ZnF2/Nb2O5 = 1:7 dargestellt. Die durchstrahlungselektronenmikroskopischen Aufnahmen in Hochauflösung zeigen, daß eine Blockstruktur aus monoklin angeordneten, kantenverküpften [3 × 5]-Böcken wie bei MgNb14O35F2 vorliegt, wobei die untersuchten Kristallbereiche nur einen geringen Fehlordnungsgrad aufweisen. Aus der Auswertung des Guinierdiagrammes resultieren für die Elementarzelle die Daten: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm a} = 20.68,{\rm b} = 3.83,{\rm c} = 19.24{\AA},{\rm \beta } = 108.35\deg $$\end{document}.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 564 (1988), S. 7-16 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Electronmicroscopical Investigation of Monoclinic (Zn,Nb)12O29 and (Mg,Nb)12O29Different chlorinating transport agents were tried for the chemical transport of Zn2/3Nb11 1/3O29 and Mg2/3Nb11 1/3O29. With NH4Cl we succeeded in getting solid solutions of M2/3Nb11 1/3O29 (M = Zn or Mg) and Nb12O29. Only Mg2/3Nb11 1/3O29 could be deposited as a pure phase using HgCl2 as transport agent. The investigation of the transport products with a transmission electron microscope confirmed the expected structure of edge sharing [3×4] blocks like Nb12O29. Nevertheless many different defective crystal areas were observed.
    Notes: Verschiedene chlorierende Transportmittel wurden für den chemischen Transport von Zn2/3Nb11 1/3O29 und Mg2/3Nb11 1/3O29 erprobt. Mit NH4Cl gelang es, Mischkristalle von M2/3Nb11 1/3O29 (mit M = Zn oder Mg) und Nb12O29 zu erhalten. Phasenrein ließ sich nur Mg2/3Nb11 1/3O29 mit dem Transportmittel HgCl2 abscheiden. Die Untersuchung der Transportprodukte mit dem Transmissionselektronenmikroskop bestätigte den Aufbau aus kantenverknüpften [3×4]-Blöcken wie bei Nb12O29. In vielen Kristallbereichen wurde allerdings eine unterschiedliche Fehlordnung beobachtet.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 578 (1989), S. 240-240 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 559 (1988), S. 208-208 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 551 (1987), S. 240-240 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 578 (1989), S. 240-240 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 554 (1987), S. 14-24 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical Transport of Oxoniobates of Zinc and CadmiumThe suitability of different chlorinating transport agents for the chemical transport of the oxoniobates of zinc and cadmium has been investigated. For the first time we prepared mm3-sized crystals of CdNb2O6 and of monoclinic (Zn, Nb)12O29 by deposition from the vapour phase. For ZnNb2O6 higher transport rates could be reached with the transport agents Cl2 and NbCl5/Cl2 than by experiments with HCl. A comparison of calculated (EPCBN) and experimental transport rates made it possible to estimate enthalpy values for ZnNb2O6 and CdNb2O6.
    Notes: Die Eignung verschiedener chlorierender Transportmittel für den chemischen Transport der Oxoniobate des Zinks und Cadmiums wurde untersucht. Es gelang erstmals, mm3-große Kristalle von CdNb2O6 und von monoklinem (Zn, Nb)12O29 durch Abscheidung aus der Gasphase zu erhalten. Für ZnNb2O6 konnten mit Cl2 und NbCl5/Cl2 als Transportmittel höhere Transportraten erzielt werden als bei Versuchen mit HCl. Ein Vergleich berechneter (EPCBN) und experimenteller Transportraten ermöglichte es, Enthalpiewerte für ZnNb2O6 und CdNb2O6 abzuschätzen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Investigation of Inorganic Non-stoichiometric Compounds. XXXVII. Preparation and Transmission Electronmicroscopical Investigation of (Cu, Nb)12O29 and (Cu, Nb)15O37With gaseous HgCl2 the compound CuNb2O6 decomposes and Nb2O5 is formed, if the reaction products CuCl and CuO can migrate in a gradient of temperature (1 000 → 900°C) to the colder end of a closed ampoule. By breaking off the decomposition (Cu, Nb)12O29 and (Cu, Nb)15O37 were isolated as metastable intermediate products. The results of the high resolution transmission electronmicroscopical investigations show that the new oxides are built of edgesharing [3 × 4] and [3 × 5] blocks, respectively, in a monoclinical arrangement and are members of the structure family M3nO8n-3 (n = 4 and 5, respectively). The real structures showed different defects; during the investigation of a crystal an unusual in-situ reaction caused by the electron beam had been observed.
    Notes: Unter Einwirkung von gasförmigen HgCl2 geht CuNb2O6 in Nb2O5 über wenn die Reaktionsprodukte CuCl und CuO im Temperaturgefälle (z. B. 1 000 → 900°C) an das kältere Ende einer geschlossenen Ampulle wandern können. Durch Abbrechen des Abbauvorganges ließen sich (Cu, Nb)12O29 und (Cu, Nb)15O37 als metastabile Zwischenprodukte erhalten. Nach dem Ergebnis der hochauflösenden Durchstrahlungs-Elektronenmikroskopie sind die neuen Oxide aus kantenverknüpften [3 × 4]- bzw. [3 × 5]-Blöcken in monokliner Anordnung aufgebaut und damit als Mitglieder der Strukturfamilie M3nO8n-3 (n = 4 bzw. 5) anzusehen. Die Realstrukturen zeigten eine unterschiedliche Fehlordnung; während der Untersuchung wurde bei einem Kristall eine ungewöhnliche in-situ-Reaktion durch Einwirkung des Elektronenstrahls beobachtet.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 573 (1989), S. 240-240 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 565 (1988), S. 192-192 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstracts.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...