Radiation effect on domain and defect structure of BaTiO3 crystals

Evgeni G. Fesenko; Agata Lisinska-Czekaj; Dionizy Czekaj; Zygmunt Surowiak

doi:10.1117/12.518713

22 October 2003 Radiation effect on domain and defect structure of BaTiO₃ crystals

Evgeni G. Fesenko, Agata Lisinska-Czekaj, Dionizy Czekaj, Zygmunt Surowiak

Proceedings Volume 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics; (2003) https://doi.org/10.1117/12.518713
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

BaTiO₃ single crystals were obtained by Remeika-method from solutions of melted salts and oxides. Radioactive Co⁶⁰ isotope was employed as a source of γ-radiation. Three different radiation doses were applied: 1.2 x 10⁷ rad, 3.0 x 10⁸ rad, and 1.3 x 10⁷ rad. Temperature of single crystals during irradiation did not exceed 313 K. A few batches of crystals were subjected to irradiation, namely: single crystals with natural surface (after the crystal was grown), single crystals with the etched surface layer and single crystals which had been subjected to an influence of the strong direct and alternating electric fields before exposure. Both domain and defect structure of single crystals was investigated by the etching method, decorating method, optical microscopy and scanning electron microscopy. It has been found that irradiation causes destabilization of the domain walls of the head-to-head-type with a negative charge screening spontaneous polarization (P_s). The negative domains in a positive matrix, which did not grow through the whole crystal body, were found to decay under the influence of radiation. In a place previously occupied by decaying negative domains, defect clusters are observed. The investigations have shown that there is a close correlation between the domain structure and the defect structure of BaTiO₃ crystals.

Citation Download Citation

Evgeni G. Fesenko, Agata Lisinska-Czekaj, Dionizy Czekaj, and Zygmunt Surowiak "Radiation effect on domain and defect structure of BaTiO₃ crystals", Proc. SPIE 5136, Solid State Crystals 2002: Crystalline Materials for Optoelectronics, (22 October 2003); https://doi.org/10.1117/12.518713

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