Quasielastic central peak and acoustic anomalies in a [001] lead magnesium niobate-lead titanate single crystal have been investigated by the high-resolution micro-Brillouin scattering. Two acoustic anomalies were observed at temperatures, TC-T∼415K and TT-R∼348K. The damping showed a significant dispersion at T∼550K, associated with the enhanced dynamics of local strain fields created by the polar microregions. The temperature evolution of the quasielastic central peak exhibited anomalies in the overall intensity and relaxation time that were associated with the line shape interferences of the central peak and the acoustic mode.

Published by the AIP PublishingArticles you may be interested in Significant enhancement of energy-storage performance of (Pb0.91La0.09)(Zr0.65Ti0.35)O3 relaxor ferroelectric thin films by Mn doping Large enhancement of energy-storage properties of compositional graded (Pb1−xLax)(Zr0.65Ti0.35)O3 relaxor ferroelectric thick films Appl. Phys. Lett. 103, 113902 (2013); 10.1063/1.4821209 High energy-storage performance in Pb0.91La0.09(Ti0.65Zr0.35)O3 relaxor ferroelectric thin films J. Appl. Phys. 112, 114111 (2012); 10.1063/1.4768461 Micro-Brillouin scattering study of ferroelectric relaxor Pb [ ( Zn 1 ∕ 3 Nb 2 ∕ 3 ) 0.91 Ti 0.09 ] O 3 single crystals under the electric field along the [001] direction J. Appl. Phys. 98, 044106 (2005); 10.1063/1.2008353 Field-induced effects in the relaxor ferroelectric Pb [( Zn 1/3 Nb 2/3 ) 0.91 Ti 0.09 ] O 3 studied by micro-Brillouin scattering Appl.

Simultaneous measurements of thermal conductivity and thermal diffusivity of composite red‐sand bricks, glycerine and mercury have been made at room temperature by the recently developed transient plane source (TPS) technique. This paper describes, in brief, the theory and the experimental conditions for the simultaneous measurements of thermal conductivity and thermal diffusivity of insulators, fluids and metals. The source of heat is a hot disc made out of bifilar spirals. The disc also serves as a sensor of temperature increase in the sample. The measured values of the thermal conductivity and thermal diffusivity of these samples are in agreement with the values reported earlier using other methods. The advantage of the TPS technique is the simplicity of the equipment, simultaneous information on thermal conductivity and thermal diffusivity, and also the applicability of the technique to insulators, fluids and metals.

No abstract

Quasistatic dielectric and strain characterization of transparent relaxor ferroelectric lead lanthanum zirconate titanate ceramics Central peak and acoustic anomalies of the relaxor ferroelectric lead magnesium niobate-lead titanate single crystal studied by the micro-Brillouin scattering Appl. Phys. Lett. 91, 062911 (2007); 10.1063/1.2768306 Polar nanodomains and local ferroelectric phenomena in relaxor lead lanthanum zirconate titanate ceramics