References
- Almairac , R. , Siali , M. , Vilminot , S. , Saint-Grégoire , P. , Delplanque , G. and Barré , G. 1985 . Phase incommensurable dans le composé mixte (NH4)2(BeF4)0.82(SO4)0.18 . J. Physique Lett. , 46 : 1123
- Almairac , R. , Aarab , H. and Siali , M. 1990 . Incommensurate phases in the solid solutions (NH4)2(BeF4)1−x(SO4)x with x = 0.08 and 0.18 . Ferroelectrics , 105 : 189
- Bestgen , H. 1986 . Direct observation of discommensurations in the incommensurate superlattice of ferroelectric Rb2ZnCl4 by transmission electron microscopy . Solid State Comm. , 58 : 197
- Janovec , V. 1983 . Linear defects in incommensurate phases . Physics Lett. , 99A : 384
- Mashiyama , H. , Tanisaki , S. and Hamano , K. 1982 . X-ray study on the thermal hysteresis of the modulation wavevector in (Rb1−x K x )2ZnCl4 . J. Phys. Soc. Jpn. , 51 : 2538
- Mashiyama , H. and Kasatani , H. 1987 . Time evolution of the incommensurate phase in K2ZnCl4 observed by dielectric measurements and X-ray scatterings . J. Phys. Soc. Jpn. , 56 : 3347
- Onodera , A. and Shiozaki , Y. 1979 . X-ray study of crystal structures and phase transitions in ferroelectric ammonium fluoroberyllate (NH4)2BeF4 . J. Phys. Soc. Jpn. , 46 : 157
- Pan Xiaoqing Unruh , H.-G. 1990 . Electron microscopy study of discommensurations in K2ZnCl4 . J. Phys.: Condens. Matter , 2 : 323
- Parlinski , K. 1987 . Molecular-dynamics simulation of a model with incommensurate phases . Phys. Rev. B , 35 : 8680
- Parlinski , K. 1989 . Molecular-dynamics study of phase transitions between incommensurate and commensurate phases . Phys. Rev. B , 39 : 12154
- Sakata , H. , Hamano , K. , Pan , X. Q. and Unruh , H.-G. 1990 . Nucleation and annihilation of discommensurations in the first order commensurate-incommensurate phase transition in K2ZnCl4 . J. Phys. Soc. Jpn. , 59 : 1079
- Schlemper , E. O. and Hamilton , W. C. 1966 . Neutron diffraction study of the structures of ferroelectric and paraelectric ammonium sulfate . J. Chem. Phys. , 44 : 4498
- Strukov , B. A. , Taraskin , S. A. and Reshetnikova , L. N. 1987 . Thermal properties of crystals belonging to the system (NH4)2(BeF4)1−x (S4) x . Sov. Phys. Sol. State , 29 : 1731
- Strukov , B. A. 1989 . Global hysteresis in ferroelectrics with incommensurate phase transitions . Phase Transitions , 15 : 143
- Vlokh , O. G. , Kaminskii , B. V. , Kityk , A. V. , Polovinko , I. I. and Sveleba , S. A. 1987 . Thermooptic memory effect and transport phenomena in the incommensurate phase of A2BX4 crystals . Sov. Phys. Sol. State , 29 : 1279