Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3275704
Keywords
bismuth compounds; crystal structure; dielectric depolarisation; grain size; piezoceramics; piezoelectricity; sodium compounds; stoichiometry
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Funding
- Korean Government [2009-0088570]
- Ministry of Education, Science and Technology (MEST)
- Korea Institute for Advancement of Technology (KIAT)
- National Research Foundation of Korea [20080703114420, 과C6B2011, 2009-0088570, 핵06B2813] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Effects of Na nonstoichiometry in (Bi0.5Na0.5+x)TiO3 ceramics were investigated in the range of x=(-5)-(+1) mol % of Na-0.5. A rhombohedral perovskite structure was maintained at all compositions with no secondary phases. Grain size decreased with Na nonstoichiometry. Piezoelectric coefficient (d(33)) increased from 74 pC/N at x=0 up to 91 pC/N at x=-3.5 then dropped with further Na deficiency. Depolarization temperature (T-d), on the other hand, decreased from 190 degrees C at x=0 down to 112 degrees C at x=-3.5 then increased. Rhombohedral lattice distortion (90-alpha) decreasing with Na deficiency was a key factor for the variation in d(33) and T-d.
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