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20 Sep 2010

Volume 97, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 97, 123101 (2010); http://dx.doi.org/10.1063/1.3490637 (3 pages)

Mark W. Licurse and Peter K. Davies
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Phase diagram and electrostrictive properties of Bi0.5Na0.5TiO3–BaTiO3–K0.5Na0.5NbO3 ceramics

Shan-Tao Zhang, Feng Yan, Bin Yang, and Wenwu Cao

Appl. Phys. Lett. 97, 122901 (2010); http://dx.doi.org/10.1063/1.3491839 (3 pages) | Cited 6 times

Online Publication Date: 23 September 2010

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Phase diagram of Bi0.5Na0.5TiO3–BaTiO3–K0.5Na0.5NbO3 ternary system has been analyzed and (0.94−x)BNT–0.06BT–xKNN (0.15 ≤ x ≤ 0.30) ceramics have been prepared and investigated. Pseudocubic structures were confirmed by x-ray diffractions and its preliminary Rietveld refinements. P-E, S-E, and S-P2 profiles (where P, E, and S denote polarization, electric field, and strain, respectively) indicate electrostrictive behavior of all ceramics. The compositions with x = 0.20 and 0.25 show pure electrostrictive characteristics. The dissipation energy, electrostrictive strain, and electrostrictive coefficient have been determined and compared with other lead-free and lead-containing electrostrictors. The electrostrictive coefficient can reach as high as 0.026 m4/C2, about 1.5 times of the value of traditional Pb-based electrostrictors.
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81.30.Dz Phase diagrams of other materials
61.66.Fn Inorganic compounds
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
77.65.-j Piezoelectricity and electromechanical effects

A study of phase coexistence and temperature dependent monoclinic to tetragonal phase transition in the multiferroic (1−x)Pb(Fe1/2Nb1/2)O3−xPbTiO3 (x = 0.08)

Satendra Pal Singh, Songhak Yoon, Sunggi Baik, Namsoo Shin, and Dhananjai Pandey

Appl. Phys. Lett. 97, 122902 (2010); http://dx.doi.org/10.1063/1.3486159 (3 pages) | Cited 3 times

Online Publication Date: 23 September 2010

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The origin of coexistence of tetragonal and monoclinic phases in the morphotropic phase boundary (MPB) region of (1−x)Pb(Fe1/2Nb1/2)O3−xPbTiO3 has been investigated for x = 0.08 by synchrotron x-ray powder diffraction in the 10–550 K range. It is shown that the phase coexistence observed at room temperature in the MPB region is essentially due to a first order phase transition between the low temperature monoclinic and high temperature tetragonal phases. This transition is shown to be accompanied with a phase coexistence over a very wide temperature range (ΔT ∼ 200 K) across the room temperature.
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81.30.-t Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
05.70.Fh Phase transitions: general studies
75.85.+t Magnetoelectric effects, multiferroics

Study of phase transitions in ternary lead indium niobate-lead magnesium niobate-lead titanate relaxor ferroelectric morphotropic single crystals

Peter Finkel, Harold Robinson, Joseph Stace, and Ahmed Amin

Appl. Phys. Lett. 97, 122903 (2010); http://dx.doi.org/10.1063/1.3491218 (3 pages) | Cited 10 times

Online Publication Date: 24 September 2010

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In this work we report on the elastic hysteretic behavior observed in ferroelectric lead indium niobate-lead magnesium niobate-lead titanate (PIN-PMN-PT) relaxor single crystals under conditions of cooperative stress, temperature, and electric field. Room temperature elastic response displays strong and sharp discontinuity associated with stress induced phase transition. Quasistatic elastic response and ultrasonic wave propagation measurements demonstrated that this strain discontinuity in PIN-PMN-PT single crystal is associated with a ferroelectric rhombohedral (FR)—ferroelectric orthorhombic (FO) phase transition. The temperature dependent elastic response and transition strain were modeled by Devonshire theory. The crystal instability under compression is significantly improved by application of a dc bias electric field.
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64.70.K- Solid-solid transitions
77.80.Jk Relaxor ferroelectrics
62.20.D- Elasticity
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.65.+k Acoustical properties of solids
81.40.Lm Deformation, plasticity, and creep
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