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XRD measurements were carried out on plasma sprayed titanates BaTiO3, CaTiO3, MgTiO3 and a mixture of the last two. Samples were tested as dielectrics and volume resistivities of the materials were also summarized. Microwave microscopy was used for mapping of the dielectric response of selected samples. The results show differences in the crystal structure between plasma sprayed coatings and feedstock powders in the case of BaTiO3 and MgTiO3 whereas CaTiO3 is crystalograffically identical with its feedstock. The reason can be found in larger sensitivity of BaTiO3 and MgTiO3 to the reductive conditions at plasma spraying whereas CaTiO3 seems to be rather inert from this viewpoint. However CaTiO3 exhibits anomalous dielectric losses because of intrinsic conductivity.


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Selected aspects of dielectric behavior of plasma sprayed titanates

Show Author's information Pavel CTIBORa,*( )Josef SEDLACEKb
Institute of Plasma Physics, ASCR, v.v.i., Za Slovankou 3, Prague, Czech Republic
Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University, Technicka 2, Prague, Czech Republic

Abstract

XRD measurements were carried out on plasma sprayed titanates BaTiO3, CaTiO3, MgTiO3 and a mixture of the last two. Samples were tested as dielectrics and volume resistivities of the materials were also summarized. Microwave microscopy was used for mapping of the dielectric response of selected samples. The results show differences in the crystal structure between plasma sprayed coatings and feedstock powders in the case of BaTiO3 and MgTiO3 whereas CaTiO3 is crystalograffically identical with its feedstock. The reason can be found in larger sensitivity of BaTiO3 and MgTiO3 to the reductive conditions at plasma spraying whereas CaTiO3 seems to be rather inert from this viewpoint. However CaTiO3 exhibits anomalous dielectric losses because of intrinsic conductivity.

Keywords:

plasma spraying, dielectric properties, electrical properties, BaTiO3 and titanates, capacitors
Received: 01 March 2011 Revised: 15 March 2011 Accepted: 19 March 2011 Published: 29 June 2012 Issue date: March 2012
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Publication history
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Publication history

Received: 01 March 2011
Revised: 15 March 2011
Accepted: 19 March 2011
Published: 29 June 2012
Issue date: March 2012

Copyright

© The author(s) 2012

Acknowledgements

The authors thank to J. Dubsky (IPP ASCR) for XRD measurements, to M. Savinov (Inst. of Physics ASCR) for the temperature measurement of dielectric properties of CaTiO3. Scanning microwave microscopy was done by M. Fenner (Agilent, Germany). BaTiO3 was sprayed at University of Limoges, France. This work was supported by the Czech Science Foundation (No. P205/11/2311).

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