Structure evolution and phase development of NKN-BNT piezoelectric ceramics

Huiqing Fan; Laijun Liu

doi:10.1117/12.840381

20 October 2009 Structure evolution and phase development of NKN-BNT piezoelectric ceramics

Huiqing Fan, Laijun Liu

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74934H (2009) https://doi.org/10.1117/12.840381
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

Na_0.5K_0.5NbO₃ (NKN) and Bi_0.5Na_0.5TiO₃ (BNT) are the most potential candidates of lead-base piezoelectric materials. The microstructure and phase transition behavior as well as dielectric and piezoelectric properties of NKN-BNT solid solution fabricated by mechanical alloying method were investigated. Nanopowder (~35 nm) could be obtained after calcining at a relative low temperature. A coexistence region of tetragonal and orthorhombic was found in pure NKN, and the region shifted to low temperature ranges with the introduction of impurities or the second phase. The crystal structure and microstructure of NKN-BNT solid solution changed dramatically with the increaseing of BNT, and all phase transition temperatures deduced. The coexistence region shifted to room temperature while the amount of BNT is at 6 mol %. The morphotropic phase boundary (MPB) as well as the polymorphism behavior (PPB) of NKN-BNT solid solution is discussed in detail.

Citation Download Citation

Huiqing Fan and Laijun Liu "Structure evolution and phase development of NKN-BNT piezoelectric ceramics", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74934H (20 October 2009); https://doi.org/10.1117/12.840381

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