Planar Faults and Grain Boundary Precipitation in Non-Stoichiometric (Sr, Ca)TiO_3 Ceramics : Condensed Matter
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概要
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Microstructures of non-stoichiometric-composition (Sr_<0.85>Ca_<0.15>O)_xTiO_2 ceramics (with x=0.98 and 1.02) were observed using high-resolution transmission electron microscopy and scanning transmission electron microscopy. Precipitation of Magneli-phase was found at the grain boundary in the specimen for x=0.98, and Ruddlesden-Popper-type insertion layers in that for x=1.02. The crystallographic site occupancy of impurity atoms determined by ALCHEMI (Atom Location using CHanneling-Enhanced MIcroanalysis), showed that the excess TiO_2 was precipitated as Magneli phase in the specimen for x=0.98, and similarly that excess SrO formed insertion planar faults of NaCl type in that for x=1.02. No anti-site point defects were formed in either of the specimens.
- 社団法人応用物理学会の論文
- 1988-07-20
著者
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SHIRASAKI Shinichi
National Institute for Research in Inorganic Materials
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Fujimoto Masayuki
Taiyo Yuden Co. Lid.
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Tanaka Junzo
National Institute For Materials Science
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