Phase transition in ferroelectric (CH3)2NH2H2AsO4 and its dielectric property

Dielectric, AC calorimetric and X-ray investigations were carried out for the single crystal of (CH 3 ) 2 NH 2 H 2 AsO 4 . It was found that the crystal undergoes the ferroelectric phase transition of second order at 274.5 K(= T c ), and has a spontaneous polarization P s =4.5 µC/cm 2 at 93 K. The phase transition of (CH 3 ) 2 NH 2 H 2 AsO 4 is characterized by the symmetry change from the monoclinic space group P 2 1 / n to P n . The temperature dependence of the static dielectric constant e 0 observed for (CH 3 ) 2 NH 2 H 2 AsO 4 , which shows deviation from the Curie-Weiss law, can be described well above T c except near T c by the expression based on the quasi-one-dimensional Ising model.

[1]  G. Busch,et al.  Eine neue seignette-elektrische Substanz , 1935, Naturwissenschaften.

[2]  J. Hatori,et al.  Phase Transition in (CH3)2NH2H2PO4 and Its Ferroelectric Activity , 1996 .

[3]  R. Choudhary,et al.  Structure of partially deuterated TlH2AsO4 , 1987 .

[4]  M. Komukae,et al.  Critical Slowing-Down and Static Dielectric Constant of Monoclinic RbD2PO4 , 1985 .

[5]  E. Nakamura,et al.  Effects of Deuteration on the Dielectric Properties of Ferroelectric CsH 2 PO 4 . I. Static Dielectric Properties , 1982 .

[6]  R. Choudhary,et al.  Structural studies of the monoclinic dihydrogen phosphates: II. A neutron-diffraction study of TlH2PO4 , 1981 .

[7]  R. Nelmes,et al.  Structural studies of deuterated CsH2AsO4 in its paraelectric and ferroelectric phases , 1981 .

[8]  A. I. Baranov,et al.  Pseudo One-Dimensional Ferroelectric Ordering and Critical Properties of Cs H 2 P O 4 and Cs D 2 P O 4 , 1979 .

[9]  A. Sequeira,et al.  A precision neutron diffraction study of tetragonal RbH2PO4 , 1978 .

[10]  S. Salinas,et al.  Theory of the phase transition in the quasi-one-dimensional hydrogen-bonded ferroelectric crystal PbHPO4 , 1978 .

[11]  Y. Uesu,et al.  Crystal structure and ferroelectricity of cesium dihydrogen phosphate CsH2PO4 , 1976 .

[12]  W. H. Baur,et al.  Refinement of the crystal structures of ammonium dihydrogen phosphate and ammonium dihydrogen arsenate , 1973 .

[13]  William R. Cook,et al.  Thermal Expansion of Crystals with KH2PO4 Structure , 1967 .

[14]  R. S. Pease,et al.  A neutron diffraction study of potassium dihydrogen phosphate by Fourier synthesis , 1953, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.