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The sintering and electrical properties of A-site-deficient perovskites, namely, ( Sr  0.7  La  0.3 ) 0.85  TiO  3  with TiO  2  and ( Sr  0.7  La  0.3 ) 0.88  TiO  3  with a single perovskite phase, were investigated in air using powders synthesized by solid-state mixing. ( Sr  0.7  La  0.3 ) 0.85  TiO  3  showed much higher sintering characteristics than ( Sr  0.7  La  0.3 ) 0.88  TiO  3 . The relative density of ( Sr  0.7  La  0.3 ) 0.85  TiO  3  reached 96% at 1500 °C with zero holding time, but decreased with increasing holding time, owing to pore formation inside the sample. The resistivity of ( Sr  0.7  La  0.3 ) 0.85  TiO  3  was lower than that of ( Sr  0.7  La  0.3 ) 0.88  TiO  3  at measurement temperatures ≤600 °C, although the reverse was observed at temperatures ≥700 °C. Because the total resistivity of ( Sr , La ) TiO  3  perovskites should be governed primarily by grain boundary resistivity at low temperatures, ( Sr  0.7  La  0.3 ) 0.88  TiO  3  with many grain boundaries showed higher resistivity, compared to that of ( Sr  0.7  La  0.3 ) 0.85  TiO  3 .

international journal of modern physics. conference series

SINTERING AND ELECTRICAL PROPERTIES IN AIR FOR A-SITE DEFICIENT (Sr0.7La0.3)1-yTiO3 PEROVSKITE SAMPLES WITH AND WITHOUT TiO2 PHASE