CRYSTALLOGRAPHIC AND AL-27 NMR-STUDY ON PREMELTING PHENOMENA IN CRYSTALS OF SODIUM TETRACHLOROALUMINATE

被引:21
作者
KREBS, B
GREIWING, H
BRENDEL, C
TAULELLE, F
GAUNEESCARD, M
BERG, RW
机构
[1] TECH UNIV DENMARK, CHEM DEPT A, MOLTEN SALTS GRP, BLDG 207, DK-2800 LYNGBY, DENMARK
[2] UNIV MUNSTER, INST ANORGAN CHEM, W-4400 MUNSTER, GERMANY
[3] UNIV PARIS 06, F-75252 PARIS 05, FRANCE
[4] UNIV AIX MARSEILLE 1, CTR ST JEROME, F-13397 MARSEILLE 4, FRANCE
关键词
D O I
10.1021/ic00005a021
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The crystal structure of NaAlCl4 was determined in the orthorhombic space group P2(1)2(1)2(1) (D2(4), No. 19; Z = 4) at temperatures 138, 150, and 154 +/- 0.2-degrees-C, resulting in the lattice parameters a = 10.442 (4), 10.449 (3), 10.455 (2) angstrom, b = 9.973 (3), 9.993 (2), 10.002 (2) angstrom, and c = 6.202 (2), 6.206 (2), 6.204 (2) angstrom, respectively. Samples of the compound were investigated by differential scanning calorimetry. Al-27 NMR spectra were obtained on NaAlCl4 and LiAlCl4 solids as a function of temperature up to and above the melting points, at 157 and 146-degrees-C, respectively. In accordance with the enhanced premelting heat contents, the observed phenomena indicate the existence of a specific dynamical behavior of the components in the two crystals, involving reorientational noncontinuous movements of the AlCl4- ions and translational jumps of the alkali-metal cations.
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页码:981 / 988
页数:8
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