Dielectric relaxor behavior of Cd2Nb2O7

The dc electric-field dependence of the dielectric properties of cadmium niobate Cd2Nb2O7 single crystals is studied, and characteristics of the dielectric behavior of Cd2Nb2O7 under dc bias are revealed. The temperature (Tm) where the dielectric relaxation mode occurs is independent of dc bias levels, while its intensity is greatly suppressed and finally eliminated with increasing dc bias from 0 to 15kV∕cm. The observed dielectric relaxation features of Cd2Nb2O7 can be attributed to “dielectric relaxor” behavior, rather than “ferroelectric relaxor” behavior previously designated in literature. The physical nature of the dielectric relaxor behavior is briefly discussed.

[1]  N. Kołpakova.  Glass behavior of a relaxor Cd2Nb2O7 in a weak DC field , 2003 .

[2]  P. Syrnikov,et al.  Dielectric relaxation and ferroelectricity in Cd2Nb2O7 pyrochlore , 2002 .

[3]  C. Ang,et al.  Dielectric relaxor and ferroelectric relaxor: Bi-doped paraelectric SrTiO3 , 2002 .

[4]  S. Kapphan,et al.  Photoluminescence Spectroscopy of Chromium Doped Cd 2 Nb 2 O 7 , 2002 .

[5]  R. Guo,et al.  Effect of dc bias on dielectric properties of Cd2Nb2O7 ceramics , 2001 .

[6]  J. Petzelt,et al.  Phase transitions sequence in pyrochlore Cd2Nb2O7 studied by IR reflectivity , 2001 .

[7]  R. Guo,et al.  Cluster polarization of Cd2Nb2O7 compound , 2000 .

[8]  C. Ang,et al.  Phonon-coupled impurity dielectric modes in Sr 1-1.5x Bi x TiO 3 , 2000 .

[9]  R. Guo,et al.  Dielectric relaxation processes in Cd2Nb2O7 compound , 2000 .

[10]  M. Wiesner,et al.  Superstructure and thermal hysteresis effects at Tcurie in Cd2Nb2O7 pyrochlore , 1997 .

[11]  M. Połomska,et al.  Dielectric relaxation phenomena in Cd2Nb2O7 ferroelectric-ferroelastics , 1994 .

[12]  Z. Ye,et al.  Optical and electric investigations of the phase transitions in pyrochlore Cd2Nb2O7 , 1991 .

[13]  L. Kamzina,et al.  External forces influence on domain structure and dielectric properties of cadmium pyroniobate crystals , 1989 .

[14]  C. Randall,et al.  Dielectric and pyroelectric properties of cadmium niobate ceramics , 1989 .

[15]  L. Kamzina,et al.  The Investigation of Successive Phase Transitions in Cadmium Pyroniobate Crystal , 1985 .

[16]  V. Isupov,et al.  Unusual ferroelectric properties of cadmium pyroniobate , 1974 .

[17]  J. M. Worlock,et al.  Electric-Field-Induced Raman Scattering in SrTi O 3 and KTa O 3 , 1968 .

[18]  G. Shirane,et al.  Dielectric, X-Ray, and Optical Study of Ferroelectric Cd 2 Nb 2 O 7 and Related Compounds , 1955 .

[19]  G. Shirane,et al.  Dielectric Properties and Phase Transitions ofCd2Nb2O7andPb2Nb2O7 , 1953 .

[20]  H. Jaffe,et al.  Ferroelectricity in Oxides of Fluorite Structure , 1952 .