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求CIF数据!!!
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小弟现需要这篇文献里化合物的CIF数据(Ref= Sobolev, Mineev, Pashutin. Dokl. Akad. Nauk SSSR, 150 791 (1963)),请问哪位高人能帮忙下来啊,小弟不胜感谢!!! |
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xi2004
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2楼2009-03-15 15:20:32
huahua1216
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3楼2009-03-15 15:28:31
xi2004
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Low-temperature hexagonal modification of NaYF4 having the gagarinite structure Sobolev, B. P.; Mineev, D. A.; Pashutin, V. P. Doklady Akademii Nauk SSSR (1963), 150(4), 791-4 CODEN: DANKAS; ISSN: 0002-3264. Unavailable. NaYF4 was synthesized in 2 ways: by hydrothermal recrystn. of melt at temperature below a ® b transition point, and by direct synthesis in hydrothermal conditions from NaF and Y2O3 mixture (Na:Y = 1:1). Both processes lasted 18 h. at 500°. The product was identified by chem. and x-ray diffraction methods and found identical in both expts. It is isostructural with the lately discovered mineral gagarinite Na(YCa)F6, having hexagonal structure with crystal lattice parameters of a 5.96 and c 3.53 A. The crystallo-chem. anal. made earlier for gagarinite has shown that the most proper formula for NaYF4 is Na(Y1.5Na0.5)F6, analogous to Na(YCa)F6. Thermal anal. shows that transition of the low-temperature hexagonal modification to the high-temperature cubic one (b ® a) begins at 670°. The reverse effect (a ® b) is much slower. It has been proved that the high-temperature modification has a fluorite structure. |

4楼2009-03-15 15:48:13
xi2004
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5楼2009-03-15 15:55:44












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