Dielectric behavior of lead magnesium niobate relaxors

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.8165· OSTI ID:544245

Cheng, Z; Katiyar, R S ^[1]; Yao, X ^[2]; Guo, A ^[3]

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1. Department of Physics, P.O. Box 23343, University of Puerto Rico, San Juan, Puerto Rico 00931-3343 (United States)
2. Electronic Materials Research Laboratory (EMRL), Xi`an Jiaotong University, Xi`an 710049 (China)
3. Department of Technological Physics, P.O. Box 207, Xidian University, Xian 710071 (China)

The dielectric behavior of a solid solution, 10 mol{percent} lead titanate in lead magnesium niobate, is measured at different frequencies from 100 Hz to 100 kHz in the temperature range from {minus}100 to 120{degree}C. A standardizing method is introduced to analyze the curve of the dielectric constant vs temperature. It results a master curve behavior between the dielectric constant and temperature at temperatures higher than the temperature of the dielectric constant maximum. The dielectric relaxation behavior is analyzed with various models. The best way to characterize the degree of the dielectric relaxation for relaxor ferroelectrics is established using the experimental data. It is indicated that the temperature dependence of the static dielectric constant can be well described by an exponential function, while the temperature dependence of the relaxation time is described by a superexponential function. Based on the specialty of the relaxor ferroelectrics, a distribution function for the relaxation times is introduced and a model is introduced to simulate the dielectric behavior of the relaxor ferroelectrics. The model can express well both the temperature and frequency dependence of the dielectric behavior for a relaxor ferroelectrics. All of the parameters in the fitting formula can be experimentally determined. The model shows that in the low-temperature range, there are two simple relationships about the dielectric frequency spectrum: {var_epsilon}{sup {prime}{prime}}({omega},T)=({minus}{pi}/2){partial_derivative}{var_epsilon}({omega},T)/{partial_derivative}ln{omega} and {var_epsilon}=B(T){sup {asterisk}}(ln{omega}{sub 0}{minus}ln{omega}). These relationships are verified by the experimental results. A way to obtain the accurate value of {var_epsilon}{sub {infinity}} in the low-temperature range is described. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: FG02-91ER75674
• OSTI ID: 544245
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DIELECTRIC PROPERTIES
FERROELECTRIC MATERIALS
FREQUENCY DEPENDENCE
LEAD COMPOUNDS
MAGNESIUM COMPOUNDS
NIOBATES
NIOBIUM COMPOUNDS
PHASE TRANSFORMATIONS
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K