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
  • 1980-1984  (3)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 64-65 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Indexed powder patterns of the monoclinic phase, stable at room temperature, and of the orthorhombic phase, stable for T 〉 786 K, are given. The cell dimensions are: a = 15.737 (8), b = 9.231 (5), c = 18.224 (9) Å, β = 125.46 (2)° at 295 K; a = 9.330 (3), b = 12.868 (5), c = 9.242 (3) Å at 818.6 K. Linear equations describing the thermal expansion of the two phases of ferric molybdate are reported. To verify if ferric molybdate can incorporate excess MoO3, measurements on non-stoichiometric samples were also made: no evidence of the presence of excess MoO3 was found.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 471-475 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The structure of the β-alumina mirror plane is investigated with a powder diffraction technique in several crystals: Ag β, dehydrated Na β and hydrated Na β. At 295 and 423 K, an Ag+ distribution is found which agrees with that reported in the literature. With increasing temperature from 423 to 879 K, the Ag+ fraction in the aBR (anti-Beevers–Ross) sites decreases from 0.34 to 0.15. Hydration of Na β-alumina crystals does not seem to cause an appreciable change in the Na+ distribution. Analysis of the reflection intensities gives the exact quantity of absorbed water.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 28 (1983), S. 303-309 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Charackterisierung des Wasseradsorptionsprozesses an Li(50%)-Na(50%)β-Aluminiumoxid wurden TG-, DSC- und Röntgendiffraktionsmessungen ausgeführt. Der Gleichgewichtswassergehalt, die Dehydratisierungsenthalpien und die Gitterparameter wurden bestimmt und mit denen früher für reines Li- und Na-β-Aluminiumoxid erhaltenen Werten verglichen. Was die Dehydratisierungsenthalpie und den Temperaturbereich der Dehydratisierung betrifft, so verhält sich das gemischteβ-Aluminiumoxid sehr ähnlich dem Li-β-Aluminiumoxid, während es hinsichtlich des Gleichgewichtswassergehaltes und der Gitterkonstantec dem Na-β-Aluminiumoxid sehr nahe steht.
    Abstract: Резюме С целью определения п роцесса поглощения в оды смешанным Li(50%) — Na(50%)β-алюмином, проведены его ТГ, ДСК и рентгенографически е исследования. Опред елено равновесное содержа ние воды, значение энт альпии дегидратации и парам етр решетки. Полученные результа ты сопоставлены с ран ее полученными для чист ых Li и Naβ-алюминов. Относительно энталь пии дегидратации и те мпературной области, в которой про исходит дегидратация, смешан ныйβ-алюмина подобе н чистому Liβ-алюмину. Значения р авновесного qsодержания воды и вели чина постоянной реше тки вдоль с-кристаллогра фической оси для смешанного алюми на подобны чистому Naβ-алюмину.
    Notes: Abstract TG, DSC and X-ray measurements were made to characterize the water absorption process by Li (50%) — Na (50%)β-alumina. The equilibrium water content, dehydration enthalpies and lattice parameter values have been determined and compared with those previously obtained for pure Li and Naβ-aluminas. The mixedβ-alumina is shown to be very similar to Liβ-alumina as concerns the dehydration enthalpy and the temperature range in which the dehydration occurs, while it seems to be very similar to Naβ-alumina with respect to the equilibrium water content andc-axis values.
    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...