LOW-FREQUENCY DIELECTRIC-RELAXATION IN OXIDIC PYROCHLORES CD2NB2O7 AND CD2TA2O7

被引：8

作者：

KOLPAKOVA, NN ^{[1
]}

POLOMSKA, M ^{[1
]}

WOLAK, J ^{[1
]}

机构：

[1] POLISH ACAD SCI,INST MOLEC PHYS,PL-60179 POZNAN,POLAND

来源：

FERROELECTRICS | 1992年 / 126卷 / 1-4期

关键词：

D O I：

10.1080/00150199208227051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electric permittivity of Cd2Nb2O7 and Cd2Ta2O7 single crystals was investigated in the frequency region of 1 kHz-1 MHz. A low-frequency dielectric relaxation in these isostructural pyrochlores is observed over the whole temperature region from 90 to 300 K, but only below phase transitions. The relaxation results from thermal displacements of the "seventh" oxygens with respect to Cd2+ ions of the (CdO8)n- polyhedra. In Cd2Nb2O7, the dielectric relaxation is also determined by thermal vibrations of domain walls in ferroelectric phase.

引用

页码：151 / 155

页数：5

共 8 条

[1] FERROELECTRIC AND ANTI-FERROELECTRIC MATERIALS WITH PYROCHLORE STRUCTURE [J].

BERNARD, D ;

PANNETIER, J ;

LUCAS, J .

FERROELECTRICS, 1978, 21 (1-4) :429-431

[2] PYROCHLORES .8. STUDIES OF SOME 2-5 PYROCHLORES AND RELATED COMPOUNDS AND MINERALS [J].

BRISSE, F ;

STEWART, DJ ;

SEIDL, V ;

KNOP, O .

CANADIAN JOURNAL OF CHEMISTRY-BACK YEAR, 1972, 50 (22) :3648-+

[3] DIELECTRIC, X-RAY, AND OPTICAL STUDY OF FERROELECTRIC CD2NB2O7 AND RELATED COMPOUNDS [J].

JONA, F ;

SHIRANE, G ;

PEPINSKY, R .

PHYSICAL REVIEW, 1955, 98 (04) :903-909

[4]

KOLPAKOVA NN, 1982, FIZ TVERD TELA+, V24, P1729

[5]

KOLPAKOVA NN, 1987, FIZ TVERD TELA+, V29, P2638

[6] STRUCTURAL CHARACTERISTICS OF PYROCHLORE FORMATION [J].

MCCAULEY, RA .

JOURNAL OF APPLIED PHYSICS, 1980, 51 (01) :290-294

[7] PHASE-TRANSITION IN CD2TA2O7 AND CD2NB2-XTAXO7 SERIES [J].

SLEIGHT, AW ;

BIERLEIN, JD .

SOLID STATE COMMUNICATIONS, 1976, 18 (01) :163-166

[8] THERMAL HYSTERESIS OF THE DIELECTRIC-CONSTANT AND ANOMALOUS BEHAVIOR OF THE RAMAN SOFT MODE DAMPING OF CD2NB2O7 [J].

SMOLENSKY, GA ;

KOLPAKOVA, NN ;

KIZHAEV, SA ;

SHER, ES .

FERROELECTRICS, 1987, 73 (1-2) :161-169

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