References
- Kim , D. , Kwun , S. and Yoon , J. (1998) . Linear birefringence behavior of A 2 BX 4 near the normal-incommensurate phase transition . Physical Review B , 57 : 11173
- Hironori Matsunaga . (1982) . X-ray structural study of the successive phase transitions in ammonium tetrachlorozincate, (NH4)2ZnCl4. I. Crystal structure determination . Journal of the Physical Society of Japan , 51 : 864
- Beloborova , I. A. , Moskalev , A. K. , Bizukina , N. V. , Misul , S. V. and Aleksandrova , I. P. (1980) . Ferroelectricity and phase transition from incommensurate phase into commensurate one in (NH4)2ZnCl4 . Solid State Communications , 33 : 1101
- Hironori Matsunaga Eiji Nakamura . (1981) . Successive phase transitions in (NH4)2ZnCl4 . Journal of the Physical Society of Japan , 50 : 2789
- de Brujn-Hordijk , G. J. , Van Koningsveld , H. , Laman , C. D. and Tuinstra , F. (1993) . Thermal histroy of the ferroelastic domain structure of (NH4)2ZnCl4 to elucidate the problem of phase transition . Ferroelectrics (UK) , 140 : 239 – 244 .
- van Koningsveld , H. (1983) . Twinning by pseudomerohedry in ammonium tetrachlorozincate (II), (NH4)2ZnCl4 a reinvestigation of the crystal structure at room temperature . Acta Cryst. , C39 : 15
- Kim , D. , Kwun , S. and Yoon , J. (1998) . Linear birefringence behavior of (NH4)2ZnCl4 and [N(CH3)4]2CuCl4 near the normal-incommensurate phase transition . Journal of the Korean Physical Society , 32 : S898
- de Brujn-Hordijk , G. J. , Peterse , W. J. A. M. , Laman , C. D. , Van der Berg , A. J. and Tuinstra , F. (1993) . Coexistence of a ferroelectric and a ferroelastic domain structure: (NH4)2ZnCl4 in its phase V . Ferroelectrics (UK) , 140 : 281 – 286 .
- Mroz , B. , Tylczynski , Z. , Kiefte , H. and Clouter , M. J. (1996) . Brillouin scattering studies of (NH4)2ZnCl4 crystal in the vicinity of its ferroelectric phase transition . Ferroelectrics (Switzerland) , 185 : 119 – 122 .
- Sato , T. , Osaka , T. and Makita , Y. (1984) . J. Phys. Soci. Japan , 53 : 1907
- Burris , J. L. , Tereshchenko , L. , Kabos , P. , Hochheimer , H. D. , Luspin , Y. , Evenson , C. R. and Dorhout , P. K. (2000) . High pressure Brillouin scattering and energy dispersive X-ray diffraction study of (NH4)2ZnCl4 . Journal of Physics and Chemistry of Solids , 61 : 719
- Lang , W. G. , Farach , H. A. , Creswick , R. J. and Poole , C. P. (1998) . ESR study of the incommensurate phase in doped (NH4)2ZnCl4 . Physical Review B – Condensed Matter , 57 : 14
- Tareev B. (1979) Physics of Dielectric Materials English Translation, Chap. 8 Mir Publishers p. 523
- Dienes G. J. Vineyard G. H. (1957) Radiation Effects in Solids Interscience publishers, Ltd INC New York, London p. 1, 3
- Gesi , K. and Lizumi , M. (1979) . J. Phys. Soci. Japan , 46 : 697
- Gaffar M. A. Abu El-Fadl A. Bin Anooz S. Submitted for publication
- Electronic States Optical Transmission in Solids Chap. 5 Pergamon New York 1975 p. 149
- Gaffar , M. A. , Abu El-Fadl , A. and Bin Anooz , S. (2003) . Physica B , 327 : 43
- Pacesova , P. , Brezina , B. and Jastrabik , L. (1986) . Optical properties of K2SeO4 in the vicinity of phase transition . Phys. Stat. Sol. (b) , 116 : 645
- Abu El-Fadl , A. (1998) . Electrical and optical investigations of Rb2ZnCl4 crystals in the vicinity of the incommensurate phase . Eur. Phys. J. AP , 4 : 5
- El-Korashy , A. , Abu El-Fadl , A. and El-Zahid , H. (2001) . Influence of temperature on the optical band gap of K2ZnCl4 single crystals doped with Cs2+ ions in the ferroelectric phase . Physica B , 304 : 437
- Fernando , J. L. and Martin , A. (1988) . EPR and optical absorption of a self-trapped hole in Rb2ZnCl4 crystals . Physical Review B , 38 : 6392
- El-Korashy , A. and Abu El-Fadl , A. (1999) . Temperature dependence of the optical band gap of nearly perfect K2ZnCl4 single crystals in the ferroelectric phase . Physica B , 271 : 205
- Montemezzani , G. , Hulliger , J. , Gunter , P. and Fousek , J. (1991) . Influence of ultraviolet irradiation on the optical absorption spectrum of iron-doped triglycine sulphate (TGS) crystals and aqueous solutions . Phys. Stat. Sol. (a) , 127 : 529
- Gaffar , M. A. and Abu El-Fadl , A. (1999) . Effect of doping and irradiation on optical parameters of triglycine sulphate single crystals . Cryst. Res. Technol. , 34 : 915