Structural, microstructural and electrical properties of BiFeO₃-BaTiO₃ ceramics with high thermal stability

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• 作者：Huabin Yang^a ; ^b ; Changrong Zhou^b ; ^{zcr750320@yahoo.com.cn} ; Xinyu Liu^a ; ^b ; Qin Zhou^b ; Guohua Chen^b ; Hua Wang^b ; Weizhou Li^c
• 关键词：A. Electronic materials ; C. X-ray diffraction ; D. Ferroelectricity ; D. Piezoelectricity
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：47
• 期：12
• 页码：4233-4239
• 全文大小：1614 K

文摘

Structural, microstructural, electrical properties and their thermal stability for (1 ? x)BF-xBT system where x ranges from 0.20 to 0.35 have been investigated. Its phase diagram shows a morphortropic phase boundary (MPB) with the coexistence of rhombohedral and pseudo-cubic phases for the composition around 0.275 ¡Ü x ¡Ü 0.30. The optimized piezoelectric properties with d₃₃ varied from 50 to 136 pC/N and the planar electromechanical coupling factor k_p varied from 0.165 to 0.312 over a broad high Curie temperature range from 380 to above 600 ¡ãC were obtained. The results indicated that samples with pseudo-cubic phase began to depole far below Curie point, while samples with rhombohedral phase showed good resistance to thermal depoling. A high thermal stability with T_d = 460 ¡ãC, combining a high d₃₃ value of 116 pC/N, was obtained in (1 ? x)BF-xBT ceramics prepared by the conventional ceramic processing technique. The internal bias field in rhombohedral phase would stabilize the remnant polarization and favor the thermal stability.