SOFT MODES IN RELAXOR FERROELECTRICS.

K. Uchino; S. Nomura; L. E. Cross; R. E. Newnham

doi:10.1080/01411598108241305

SOFT MODES IN RELAXOR FERROELECTRICS.

K. Uchino, S. Nomura, L. E. Cross, R. E. Newnham

Electrical Engineering

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18 Scopus citations

Abstract

The fact that the polarization-related electrostrictive coefficients Q in the relaxor type ferroelectrics are almost an order of magnitude smaller than in most normal ferroelectric perovskites can be explained under the assumption that the temperature dependence of the soft-mode TO phonon frequency is given as omega **2//T//O equals A(T minus T//c), where the coefficient A in relaxor ferroelectrics is an order of magnitude smaller than the value in normal ferroelectric perovskites. The assumption also explains why the Curie-Weiss constants, C, in the relaxor crystals are several times larger than in the normal ferroelectrics. The soft-mode frequency in Pb(Mg//1/////3Nb//2/////3)O//3 crystals is predicted to be below 10 cm** minus **1 near the mean Curie temperature.

Original language	English (US)
Pages (from-to)	1-6
Number of pages	6
Journal	Phase Transitions
Volume	2
Issue number	1
DOIs	https://doi.org/10.1080/01411598108241305
State	Published - 1981

All Science Journal Classification (ASJC) codes

Instrumentation
General Materials Science

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10.1080/01411598108241305

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title = "SOFT MODES IN RELAXOR FERROELECTRICS.",

abstract = "The fact that the polarization-related electrostrictive coefficients Q in the relaxor type ferroelectrics are almost an order of magnitude smaller than in most normal ferroelectric perovskites can be explained under the assumption that the temperature dependence of the soft-mode TO phonon frequency is given as omega **2//T//O equals A(T minus T//c), where the coefficient A in relaxor ferroelectrics is an order of magnitude smaller than the value in normal ferroelectric perovskites. The assumption also explains why the Curie-Weiss constants, C, in the relaxor crystals are several times larger than in the normal ferroelectrics. The soft-mode frequency in Pb(Mg//1/////3Nb//2/////3)O//3 crystals is predicted to be below 10 cm** minus **1 near the mean Curie temperature.",

author = "K. Uchino and S. Nomura and Cross, {L. E.} and Newnham, {R. E.}",

note = "Funding Information: We wish to thank the Office of Naval Research for their support of our work through Contract No, N00014-78-C-0291.",

year = "1981",

doi = "10.1080/01411598108241305",

language = "English (US)",

volume = "2",

pages = "1--6",

journal = "Phase Transitions",

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publisher = "Taylor and Francis Ltd.",

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TY - JOUR

T1 - SOFT MODES IN RELAXOR FERROELECTRICS.

AU - Uchino, K.

AU - Nomura, S.

AU - Cross, L. E.

AU - Newnham, R. E.

N1 - Funding Information: We wish to thank the Office of Naval Research for their support of our work through Contract No, N00014-78-C-0291.

PY - 1981

Y1 - 1981

N2 - The fact that the polarization-related electrostrictive coefficients Q in the relaxor type ferroelectrics are almost an order of magnitude smaller than in most normal ferroelectric perovskites can be explained under the assumption that the temperature dependence of the soft-mode TO phonon frequency is given as omega **2//T//O equals A(T minus T//c), where the coefficient A in relaxor ferroelectrics is an order of magnitude smaller than the value in normal ferroelectric perovskites. The assumption also explains why the Curie-Weiss constants, C, in the relaxor crystals are several times larger than in the normal ferroelectrics. The soft-mode frequency in Pb(Mg//1/////3Nb//2/////3)O//3 crystals is predicted to be below 10 cm** minus **1 near the mean Curie temperature.

AB - The fact that the polarization-related electrostrictive coefficients Q in the relaxor type ferroelectrics are almost an order of magnitude smaller than in most normal ferroelectric perovskites can be explained under the assumption that the temperature dependence of the soft-mode TO phonon frequency is given as omega **2//T//O equals A(T minus T//c), where the coefficient A in relaxor ferroelectrics is an order of magnitude smaller than the value in normal ferroelectric perovskites. The assumption also explains why the Curie-Weiss constants, C, in the relaxor crystals are several times larger than in the normal ferroelectrics. The soft-mode frequency in Pb(Mg//1/////3Nb//2/////3)O//3 crystals is predicted to be below 10 cm** minus **1 near the mean Curie temperature.

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SOFT MODES IN RELAXOR FERROELECTRICS.

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