Anomalies of dielectric, elastic and electromechanical properties of K-0.25(NH4)(0.75)H2PO4 single crystal in the vicinity of antiferroelectric phase transition

作者：Korotkov L N^*; Likhovaya D V; Levitskii R R; Sorokov S I; Vdovych A S

来源：Solid State Communications, 2013, 160: 52-55.

DOI：10.1016/j.ssc.2013.02.010

• H-bonded antiferroelectric
• Antiferroelectric phase transition
• Dielectric, piezoelectric and elastic anomalies
• Phase transition

The dielectric permittivities (epsilon(11) and epsilon(33)), elastic compliance (S-66) and piezoelectric constant (d(36)) for the K-0.25( NH4)(0.75)H2PO4 single crystal were studied near antiferroelectric phase transition temperature (T-N). It was found that diffused maximums in both the epsilon(11)(T) and the epsilon(33)(T) dependences as well as in the d(36)(T) dependences are observed above T-N, while narrowed peak in S-66(T) curve is located below T-N. Analysis of experimental results speaks in favor of two-stage AFE -> PE phase transition in the crystal under study. Below T-N the drastic decreasing of electromechanical coupling factor (k(36)) is found.

• 出版日期2013-4