Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3525370
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Funding
- Korean Government [2009-0088570]
- Ministry of Education, Science and Technology [2010-0025055]
- Ministry of Education, Science and Technology (MEST)
- Korea Institute for Advancement of Technology (KIAT)
- National Research Foundation of Korea [2010-0025055, 2009-0088570] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Effects of Bi nonstoichiometry on (Bi0.5+xNa) TiO3 (BNT) ceramics were investigated at x=-1+2 mol % of Bi-0.5 covering Bi deficiency and excess. At all compositions, rhombohedrally symmetric BNT perovskite formed without secondary phases. Increasing x caused smaller grains. Higher piezoelectric coefficient (d(33)) but lower depolarization temperature (T-d) occurred at Bi excess than at Bi deficiency and vice versa. Leakage current at room temperature decreased with decreasing x. Electrical conductivity of the stoichiometric BNT (x=0) from 700 to 900 degrees C increased with decreasing partial oxygen pressure from 1 to 10(-5) atm suggesting n-type conductivity at elevated temperatures. (c) 2011 American Institute of Physics. [doi: 10.1063/1.3525370]
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