Journal
TRANSACTIONS ON ELECTRICAL AND ELECTRONIC MATERIALS
Volume 12, Issue 2, Pages 64-67Publisher
SPRINGER
DOI: 10.4313/TEEM.2011.12.2.64
Keywords
Lead-free piezoelectric ceramics; Bismuth sodium potassium titanate; Tantalum-doping; Electric-fieldinduced strain
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Funding
- National Research Foundation, Republic of Korea [20100014113]
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The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of Bi-0.5(Na0.82K0.18)(0.5)Ti(1-x)TaxO(3) ceramics has been investigated. The Ta doping resulted in a transition from coexistence of ferroelectric tetragonal and rhombohedral phases to an electrostrictive pseudocubic phase, leading to degradations of the remnant polarization, coercive field, and piezoelectric coefficient d(33). However, the electricfield- induced strain was significantly enhanced by the Ta substitution-induced phase transition and reached a highest value of S-max/E-max = 566 pm/V under an applied electric field 6 kV/mm when 2% Ta was substituted on Ti sites. The abnormal enhancement in strain was attributed to the pseudocubic phase with high electrostrictive constants.
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