Reduction of microcracking in YMnO3 ceramics by Ti substitution

authors	Tomczyk, M; Senos, AMOR; Reaney, IM; Vilarinho, PM
nationality	International
journal	SCRIPTA MATERIALIA
author keywords	YMnO3; Ti doping; Microstructure; Microcracking
keywords	THERMAL-EXPANSION ANISOTROPY; ORIGIN
abstract	Microcracking in YMnO3 ceramics originates from a combination of 3.7% volume change and strong anisotropy in the thermal expansion coefficient of the hexagonal structure. In this paper, the effect of Ti doping on the microstructure, structure and dielectric response of YMnO3 ceramics is studied. Lattice anisotropy of the hexagonal cell markedly decreased with increasing Ti, reducing the residual stresses created at the high-temperature phase transition and commensurately decreasing the crack density (3.2 vol.% YMnO3 to 0.9 vol.% YMn0.9Ti0.1O3). These results represent the first systematic work to reduce microcracking in YMnO3-based ceramics. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	1359-6462
year published	2012
volume	67
issue	5
beginning page	427
ending page	430
digital object identifier (doi)	10.1016/j.scriptamat.2012.04.042
web of science category	Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category	Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier	WOS:000307434000002