Phase stabilization in plasma sprayed BaTiO3

0392140 - ÚFP 2014 RIV GB eng J - Journal Article
Ctibor, Pavel - Seiner, Hanuš - Sedláček, J. - Pala, Zdeněk - Vaněk, Přemysl
Phase stabilization in plasma sprayed BaTiO3.
Ceramics International. Roč. 39, č. 5 (2013), s. 5039-5048. ISSN 0272-8842. E-ISSN 1873-3956
R&D Projects: GA ČR(CZ) GA101/09/0702
Institutional support: RVO:61389021 ; RVO:61388998 ; RVO:68378271
Keywords : Spectroscopy * BaTiO3 * Plasma spraying * Spark plasma sintering
Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass; BJ - Thermodynamics (UT-L); JH - Ceramics, Fire-Resistant Materials and Glass (FZU-D)
Impact factor: 2.086, year: 2013
http://www.sciencedirect.com/science/article/pii/S0272884212013582

This paper presents a comparison of properties of BaTiO3 ceramics prepared by two different production methods: gas-stabilized plasma spraying (GSP) and spark plasma sintering (SPS). Samples of both materials were evaluated by various techniques, the goal being to detect the Curie temperature of the ferroelectric transformation between the tetragonal and the cubic phase. All tests, resonant ultrasound spectroscopy, dielectric measurements, differential scanning calorimetry and temperature-resolved X-ray diffraction (XRD), used in combination, proved the absence of this transformation in the case of GSP coating up to 500 °C. Similarly, the tetragonal-to-orthorhombic transition temperature is shifted downwards, this transition probably taking place in a small fraction of the volume of coating. The SPS samples exhibit several anomalies, such as a strong anisotropy of relative permittivity, but their phase transformations were detected in the usual temperature ranges
Permanent Link: http://hdl.handle.net/11104/0221099