Structure-microstructure-dielectric tunability relationship in Mn-doped strontium titanate ceramics
authors Tkach, A; Vilarinho, PM; Kholkin, AL
nationality International
journal ACTA MATERIALIA
author keywords electroceramics; X-ray diffraction; scanning/transmission electron microscopy; electrical properties
keywords ELECTRON-PARAMAGNETIC-RESONANCE; PHASE-TRANSITIONS; LOW-TEMPERATURE; SRTIO3; IONS
abstract The influence of Mn incorporation into the Sr and Ti sites of SrTiO3 ceramics on the structure, microstructure and dielectric tunability is studied in this work. For both Sr1-xMnxTiO3 and SrTi1-yMnyO3 formulations, the lattice parameter, calculated from X-ray diffraction profiles, was found to decrease with increasing Mn content, but with different rates. Transmission electron microscopy analysis indicated that the solid solubility of Mn for Sr1-xMnxTiO3 system is limited to x < 3%, while scanning electron microscopy analysis revealed a marked decrease of the grain size for SrTi1-yMnyO3 ceramic samples. The temperature range where the dielectric constant is tunable was enlarged for Sr1-xMnxTiO3 ceramics comparing with undoped SrTiO3. A higher tunability (similar to 70%) and quality factor (similar to 6000) around 75-100 K were obtained as well. It is suggested that the observed dielectric behaviour is closely related to the existence of polar microregions, formed by the introduction of Mn into the Sr site. In contrast, in SrTi1-yMnyO3 ceramics a decrease of the dielectric tunability, following a reduction of dielectric permittivity was observed. (c) 2005 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 1359-6454
year published 2005
volume 53
issue 19
beginning page 5061
ending page 5069
digital object identifier (doi) 10.1016/j.actamat.2005.07.029
web of science category Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000232859000010
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