Phase Transition and High Piezoactivity of Sr Doped Lead-Free (Na 0.53. K 0.422 Li 0.048 ) (Nb 0.89 Sb 0.06 Ta 0.05 )O 3 Ceramics
2008; Institute of Physics; Volume: 25; Issue: 7 Linguagem: Inglês
10.1088/0256-307x/25/7/066
ISSN1741-3540
AutoresLimei Zheng, Wang Jin-Feng, Ming Bao-Quan, Peng Qi, Juan Du,
Tópico(s)Multiferroics and related materials
ResumoLead-free piezoelectric ceramics (Na0.53K0.422Li0.048) (Nb0.89Sb0.06Ta0.05)O3(NKLNST) + x mol SrCO3 are prepared by conventional solid state sintering method. The specimens with pure perovskite structure show tetragonal phase at x ≤ 0.01, and become pseudo-cubic phase at x≥ 0.02. A lattice parameter discontinuity is found in the specimens with 0.004 ≤ x ≤ 0.0075, along with a great improvement in piezoactivity. The 0.004mol SrCO3 added NKLNST ceramics possesses outstanding performances of kp = 0.53, kt = 0.26, and d33 = 309 pC/N. Moreover, the Sr2+ modification inhibits the grain growth, decreases the Curie temperature, and induces a diffuse phase transition.
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