Journal
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume 57, Issue 4, Pages 892-896Publisher
KOREAN PHYSICAL SOC
DOI: 10.3938/jkps.57.892
Keywords
Lead-free piezoelectric ceramics; Bismuth sodium potassium titanate; Yttrium doping; Electric-field-induced strain
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Funding
- Ministry of Knowledge Economy, Republic of Korea [130009733]
- Korea Research Foundation [KRF-2007-211-D00052]
- National Research Foundation of Korea [2007-211-D00052] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The effects of Y doping on the crystal structure, and on the ferroelectric and the piezoelectric properties of Bi-0.5(Na0.82K0.18)(0.5)TiO3 ceramics have been investigated. The Y doping induced a transition from a ferroelectric (FE) tetragonal to an electrostrcitive (ES) pseudocubic phase, leading to the degradations of the dielectric constant, loss tangent, the remnant polarization, coercive field, and piezoelectric coefficient d(33). However, the electric-field-induced strain was significantly enhanced by the Y-doping-induced phase transition and reached the highest value of S-max/E-max = 278 pm/V when 0.7 wt% Y2O3 was doped. The abnormal enhancement in strain was attributed to the coexistence of FE and ES phases, which provided more degrees of freedom for domain reorientation under electric fields.
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