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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermal expansion analysis and structural characteristics of the (Pb, Ca)TiO3 solid solutions from 150 to 570 K

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Author(s):
F. R. Estrada ; J. A. Eiras ; D. Garcia
Total Authors: 3
Document type: Journal article
Source: Cerâmica; v. 63, n. 365, p. 116-121, Mar. 2017.
Abstract

Abstract Ceramic samples of lead modified calcium titanate (Pb1-xCaxTiO3) with calcium concentration between 0.24≤x≤0.55 were prepared and analyzed in order to determine the structural origin of the negative thermal expansion observed in this ferroelectric system. The Rietveld structural refinement method was used to assess the thermal evolution of the structural parameters using powder X-ray diffraction data collected between 150 and 570 K. Since the Pb1-xCaxTiO3 phase diagram and space groups are still unknown for the temperature range investigated, the structural analyses were based on adjustments of the refinement protocol. The results revealed the existence of a correlation between symmetry transitions and anomalies in the thermal expansion of the unit cell, being such transitions not necessarily of the ferroelectric-paraelectric nature. (AU)

FAPESP's process: 08/04025-0 - Nanostructured multifunctional multiferroic materials: synthesis, properties, phenomenology and applications
Grantee:José Antonio Eiras
Support type: Research Projects - Thematic Grants