DC Field | Value | Language |
---|---|---|
dc.contributor.author | Choo, Woong Kil | ko |
dc.contributor.author | H.J. Kim | ko |
dc.date.accessioned | 2013-02-25T14:51:30Z | - |
dc.date.available | 2013-02-25T14:51:30Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 1992-03 | - |
dc.identifier.citation | JOURNAL OF PHYSICS-CONDENSED MATTER, v.4, no.9, pp.2309 - 2321 | - |
dc.identifier.issn | 0953-8984 | - |
dc.identifier.uri | http://hdl.handle.net/10203/62997 | - |
dc.description.abstract | The behaviour of the diffuse phase transition of (Pb1-xBax)(Yb1/2Nb1/2)O3 (0 less-than-or-equal-to x less-than-or-equal-to 0.3) ceramics has been investigated with special attention to the phase boundary near x = 0.12. The temperature and frequency dependence of the dielectric constant-epsilon and loss tan-delta have been carefully measured together with heat capacity measurements. Above x = 0.12, the phase transition is broadened and frequency dependent, while the AFE-PE phase transition is sharp and epsilon closely follows the Curie-Weiss law above T(N) for 0 less-than-or-equal-to x < 0. 1. Also, above x = 0.12, (1/epsilon - 1/epsilon(m)) is proportional to (T - T(t))n at T > T(t), where epsilon(m) is the peak value of epsilon at T(t) and n is an exponent. The value of n is dramatically increased for 0.1 less-than-or-equal-to x less-than-or-equal-to 0.14, and then increased linearly with increasing Ba-content (dn/dx = 1.78 x 10(-2) %-1) for 0.14 less-than-or-equal-to x less-than-or-equal-to 0.3. T(N) decreases markedly for 0 less-than-or-equal-to x < 0. 12, whereas the value of T(t) is reduced linearly with increasing x-value (dT(t)/dx = -6.61-degrees-C %-1) for 0.14 less-than-or-equal-to x less-than-or-equal-to 0.3. Another remarkable feature is an anomalous enhancement of epsilon(m) between x = 0.1 and x = 0.14. Heat capacity measurements have revealed a well-defined anomaly associated with the AFE-PE transition, increasingly broadening with Ba-content for 0 less-than-or-equal-to x < 0.1. For 0.1 less-than-or-equal-to x less-than-or-equal-to 0.14, the heat capacity anomaly is extremely broadened and a small deviation from the extrapolated baseline can be seen. In particular, we cannot detect any heat capacity anomaly associated with T(t) above x = 0.14, which is suggested as additional evidence for DPT. These salient features are discussed in the light of the formation of locally ordered polar microdomains within a non-polar matrix and the pseudo-cubic structure above x = 0. 12. | - |
dc.language | English | - |
dc.publisher | Iop Publishing Ltd | - |
dc.subject | FERROELECTRICS | - |
dc.subject | CRYSTALS | - |
dc.subject | DISORDER | - |
dc.subject | BEHAVIOR | - |
dc.subject | POLARIZATION | - |
dc.subject | GLASSES | - |
dc.subject | STATE | - |
dc.subject | PLZT | - |
dc.title | Diffuse Phase Transition of Barium-Substituted Lead Ytterbium Niobate Ceramics | - |
dc.type | Article | - |
dc.identifier.wosid | A1992HG60700024 | - |
dc.identifier.scopusid | 2-s2.0-36149037217 | - |
dc.type.rims | ART | - |
dc.citation.volume | 4 | - |
dc.citation.issue | 9 | - |
dc.citation.beginningpage | 2309 | - |
dc.citation.endingpage | 2321 | - |
dc.citation.publicationname | JOURNAL OF PHYSICS-CONDENSED MATTER | - |
dc.contributor.nonIdAuthor | H.J. Kim | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | FERROELECTRICS | - |
dc.subject.keywordPlus | CRYSTALS | - |
dc.subject.keywordPlus | DISORDER | - |
dc.subject.keywordPlus | BEHAVIOR | - |
dc.subject.keywordPlus | POLARIZATION | - |
dc.subject.keywordPlus | GLASSES | - |
dc.subject.keywordPlus | STATE | - |
dc.subject.keywordPlus | PLZT | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.