| Autor: |
L.R. Morss, J.A. Fahey, W.T. Carnall, Manfred Irmler, C.W. Williams, Gerd Meyer, J. Fuger |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Journal of the Less Common Metals. 169:1-8 |
| ISSN: |
0022-5088 |
| DOI: |
10.1016/0022-5088(91)90229-w |
| Popis: |
[N(CH3)4]2BkCl6 was synthesized from cold, concentrated HCl(aq) using 249Bk ( t 1 2 = 320 days ) separated from 249Cf on the milligram scale. For comparison [N(CH3)4]2ZrCl6 was also synthesized and single crystals were grown. Both compounds were studied by X-ray powder diffraction, and [N(CH3)4]2ZrCl6 was also studied by single-crystal X-ray diffraction. Powder patterns of [N(CH3)4]2BkCl6 have f.c.c. symmetry, a = 13.08(2) A , isostructural with K2PtCl6 and other [N(CH3)4]2MCl6 salts. [N(CH3)4]2ZrCl6 has f.c.c. symmetry, space group Fm3m (disregarding hydrogen positions) with a = 12.882(1) A and d(Zr-Cl) = 2.428(8) A . A transition to lower symmetry was found in [N(CH3)4]2ZrCl6 at − 110 °C by Guinier powder diffraction. Optical spectra of Bk4 + in [N(CH3)4]2BkCl6 in KBr and KCl pellets were recorded and interpreted. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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