ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
SrTiO3 bicrystals with various types of grain boundaries were prepared by joining twosingle crystals at high temperature. By using the bicrystals, we examined their current-voltagecharacteristics across single grain boundaries from a viewpoint of point defect segregation in thevicinity of the grain boundaries. Current-voltage property in SrTiO3 bicrystals was confirmed toshow a cooling rate dependency from annealing temperature, indicating that cation vacanciesaccumulate due to grain boundary oxidation. The theoretical results obtained by ab-initiocalculation clearly showed that the formation energy of Sr vacancies is the lowest comparing withTi and O vacancies in oxidized atomosphere. The formation of a double Schottky barrier (DSB) inn-type SrTiO3 is considered to be closely related to the accumulation of the charged Sr vacancies.Meanwhile, by using three types of low angle boundaries, the excess charges related to one grainboundary dislocation par unit length was estimated. In this study, we summarized our resultsobtained in our group
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.851.pdf
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