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<Emphasis Type="Italic">E-T</Emphasis> phase diagram of lead magnesium niobate relaxor ferroelectric in the Mandelstam-Brillouin scattering spectra |
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| Authors: | S G Lushnikov J-H Ko Seiji Kojima |
| Institution: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia;(2) R&D Center, Samsung Corning Co., LTD, 472, Sin-dong, Paldal-gu, Suwon-si, Gyeonggi-do, Korea;(3) Institute of Materials Science, University of Tsukuba, Tsukuba city, Ibaraki 305-8573, Japan |
| Abstract: | The results of studying the velocity of hypersonic longitudinal acoustic phonons over a wide temperature range under an applied constant electric field in the PbMg1/3Nb2/3O3 (PMN) relaxor ferroelectric are reported. An analysis of the experimental data on the basis of the existing E-T phase diagrams shows the necessity of a substantial change in the current concepts. Two radically different states—with the reversible and irreversible behavior of velocity—have been observed experimentally in the induced ferroelectric phase. A modified E-T phase diagram of the PMN crystal is suggested. |
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