Resonant ultrasound spectroscopy of KTa1-xNbxO3 ferroelectric relaxor crystals

Svitelskiy, O.; Suslov, A. V.; Betts, J. B.; Migliori, A.; Yong, G.; Boatner, L. A.

doi:10.1103/PhysRevB.78.064113

Title: Resonant ultrasound spectroscopy of ${KTa}_{1 - x} {Nb}_{x} O_{3}$ ferroelectric relaxor crystals

Journal Article · Wed Aug 20 00:00:00 EDT 2008 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.78.064113· OSTI ID:963906

Svitelskiy, O. ^[1]; Suslov, A. V. ^[1]; Betts, J. B. ^[2]; Migliori, A. ^[2]; Yong, G. ^[3]; Boatner, L. A. ^[4]

Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab.
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Towson Univ., Baltimore, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Radiation Detection Materials and Systems

The influence of the development of a ferroelectric state on the elastic properties of KTa_1-xNb_xO₃ relaxor crystals is explored. The high sensitivity of all elements of the elastic stiffness tensor to the polar distortions and their reorientational dynamics is, but, individual for each particular element: c₁₁ and c₄₄ are pimarily influenced by the reorientational motion of these distortions between neighboring (111) directions; the c₁₂ mostly depends on the reorientations between cubic face diagonal (111) directions. As a result, the temperature behavior of c₁₂ demonstrates different dependence on the Nb concentration than that of c₁₁ and c₄₄. While in the 1.2% Nb crystal all three elastic constants clearly show their softening with the appearance of the dynamic polar distortions; in the 16% crystal this effect is strong for c₁₁ and c₄₄, but negligible for c₁₂. The curves of slowness and Young's modulus within (100) crystallographic plane are presented. Furthermore, the linear compressibility modulus is estimated. The value of the Debye temperature is estimated to be approximately 592 K.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC05-00OR22725; DMR-0084173

OSTI ID:: 963906

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 78, Issue 6; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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