Anelastic relaxation in SrTiO3 with O vacancies and H

We present the results of anelastic relaxation experiments (2-30 kHz) on ceramic SrTiO3 subjected to reduction in H2 atmosphere, which yields a balance between oxygen vacancy (VO) and (OH)(-) defects. The resulting anelastic spectrum contains, besides the well known structural transformation near 11...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2006-12, Vol.442 (1-2), p.55-58
Hauptverfasser:	CORDERO, F, FRANCE, A, CALDERONE, V. R, NANNI, P, BUSCAGLIA, V
Format:	Artikel
Sprache:	eng
Schlagworte:	Anelasticity, internal friction, stress relaxation, and mechanical resonances Condensed matter: structure, mechanical and thermal properties Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder Cross-disciplinary physics: materials science rheology Exact sciences and technology Materials science Mechanical and acoustical properties of condensed matter Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics
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Beschreibung
Zusammenfassung:	We present the results of anelastic relaxation experiments (2-30 kHz) on ceramic SrTiO3 subjected to reduction in H2 atmosphere, which yields a balance between oxygen vacancy (VO) and (OH)(-) defects. The resulting anelastic spectrum contains, besides the well known structural transformation near 110K, several thermally activated relaxation processes between 200 and 700 K. The two main elastic energy loss peaks are proposed to provide the first measurement of the hopping rate of Vo and (OH)(-) defects in pure SrTiO3.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2005.12.087