974 resultados para Jews--Russia
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by Victor Harris
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Henry Samuel Morais
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by George Cohen
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by Isidor Blum. With special contrib. by William Rosenau ...
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by Peter Wiernik
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by David Salomons
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statement of G. W. Pieritz
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by Moses Margoliouth
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by Elkan Nathan Adler
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by Maurice Fishberg
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by Jacob Mann
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by Jacob S. Raisin
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harmonized by Emanuel Aguilar
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Dehydration behaviour of the zeolite merlinoite, NaK11[Al12Si20O64]·15H2O, from the Khibiny massif (Russia) was studied by means of single-crystal X-ray diffraction conjoined with step-wise heating to 225 C. At room temperature merlinoite has the space group Immm with a = 14.0312(5), b = 14.2675(6), c = 10.0874(4) Å, and V = 2019.40(14) Å3. At 75 °C the merlinoite structure undergoes pronounced dehydration accompanied by a phase transition to a structure that has the space group P42/nmc and remains consistent at elevated temperature. A fully dehydrated phase occurs at 200 °C (at 225 °C: a = 13.341(4), b = 13.341(4), c = 9.707(4) Å, V = 1727.7(12) Å3). Dehydration-induced framework distortion and symmetry were found to be different from those observed for synthetic potassium merlinoite with the K11.5[Al11.5Si20.5O64]·15H2O composition.