Reference

Powder and single crystal study of ammonium tetrachlorozincate

Powder and single crystal study of ammonium tetrachlorozincate. Warczewski, Jerzy (Lab. Tech. Natuurkd.In this study，14639-97-5 is also used., Delft Univ. Technol., Delft, Neth.). Rap. - Inst. Fiz. Tech. Jad. AGH, INT 105/PS, 18 pp. (Russian) 1976. CODEN: IFTJA9. DOCUMENT TYPE: Report CA Section: 75 (Crystallization and Crystal Structure) Section cross-reference(s): 76 (NH4)2ZnCl4 is orthorhombic, with a 12.6197(16), b 7.2107(81), and c 9.2746(15) .ANG.. The modulation vector is 0.249(1) or 1/4; therefore, (NH4)2ZnCl4 has a superstructure with c axis equal to four times 9.2746(15) .ANG.. The space group of the superstructure is P21cn. The crystals show a pyroelec. effect. .

Physical properties of ammonium tetrachlorozincate ((NH4)2ZnCl4 and (ND4)2ZnCl4) in the vicinity of phase transitions

Physical properties of ammonium tetrachlorozincate ((NH4)2ZnCl4 and (ND4)2ZnCl4) in the vicinity of phase transitions. Mel'nikova, S. V.; Iskornev, I. M.; Zherebtsova, L. I. 90078-42-5 and 14639-97-5 are cas registry numbers. These chemicals are also mentioned in this article.; Kot, L. A.; Anistratov, A. T. (Inst. Fiz. im. Kirenskogo, Krasnoyarsk, USSR). Fiz. Tverd. Tela (Leningrad), 26(3), 776-80 (Russian) 1984. CODEN: FTVTAC. ISSN: 0367-3294. DOCUMENT TYPE: Journal CA Section: 75 (Crystallography and Liquid Crystals) Section cross-reference(s): 69, 73, 76 The dielec. properties, birefringence, and thermal expansion of (NH4)2ZnCl4 and (ND4)2ZnCl4 were studied in the temp. range which includes the phase transitions G0 ? G1 ? G2 ? G3 ? G4. The symmetry of the phases G2 and G3 is discussed. .