Microstructure and electrical properties of Bi-based lead-free piezoelectric ceramics Bi0.5 (Na0.82K0.18)0.5TiO3 - BiCrO3

作者：Zhou Chang Rong^*; Liu Xin Yu; Yang Gui Hua; Yuan Chang Lai; Jiang Min Hong

来源：Chinese Journal of Nonferrous Metals, 2009, 19(7): 1289-1293.

• Antiferroelectrics
• Bi-based
• Ceramic sintering
• Co-existence
• Dielectric and piezoelectric properties
• Electrical property
• Electro mechanical coupling factors
• Lead-free piezoelectric ceramic
• Lead-free piezoelectric ceramics
• Maximum values
• Morphotropic phase boundaries
• Perovskites structure
• Piezoelectric constant
• Piezoelectric properties
• Secondary phase
• Sodium bismuth titanate
• TiO

A new (Bi0.5Na0.5)TiO3-based lead-free piezoelectric ceramics, (1-x) Bi0.5 (Na0.82K0.18)0.5TiO3 - xBiCrO3 (BNKT-BCx), was prepared by a conventional ceramic sintering technique. The effect of Bi-based ferroelectrics of BiCrO3 on the crystal structure, dielectric and piezoelectric properties was investigated. X-ray diffraction patterns indicate that trace BiCrO3 addition (x=0-0.02) causes insignificant change in crystal structure, and an obvious secondary phase is observed in the samples with x > 0.02. The piezoelectric constant d33 and the electromechanical coupling factor kp of the ceramics attain maximum values of 168 pC/N and 0.32 near morphotropic phase boundary (MPB) that co-existence between rhombohedral and tetragonal. With increasing BiCrO3 content, the antiferroelectric phase zone gets broader and the diffuse coefficient increases.

• 出版日期2009
• 单位桂林理工大学