3-BaTiO3;無鉛"/> 3-BaTiO3體系的準(zhǔn)同型相界通常位于0.70BiFeO3-0.30BaTiO3組分附近。然而，對于BiFeO3-BaTiO3體系，BaTiO3含量越高其居里溫度越低。因此，在較低的BaTiO3含量組分附近構(gòu)建準(zhǔn)同型相界是使其同時獲得良好的壓電活性和高居里溫度的有效策略。采用固相法制備了0.74BiFe1-xGaxO3-0.26BaTiO3（x=0~0.05）系列無鉛壓電陶瓷，研究了Ga含量對其物相結(jié)構(gòu)與電性能的影響。結(jié)果表明：隨著Ga含量的增加，陶瓷樣品從三方相逐漸向贗立方相轉(zhuǎn)變。當(dāng)x≤0.01，陶瓷樣品為三方相結(jié)構(gòu)；而當(dāng)0.04≤x≤0.05，陶瓷樣品為贗立方結(jié)構(gòu)，在0.02≤x≤0.03形成了準(zhǔn)同型相界（三方-贗立方）。另外，由于容忍因子的升高，該系列陶瓷的居里溫度隨著Ga含量的增加而略有降低。位于準(zhǔn)同型附近的陶瓷樣品表現(xiàn)出良好的壓電活性和較高的居里溫度。"/>

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0.74BiFe1- x Ga x O3-0.26BaTiO3 高溫?zé)o鉛壓電陶瓷的相變行為及電性能
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作者單位:

1.華南理工大學(xué) 材料科學(xué)與工程學(xué)院，廣東 廣州 510640;2.廣州凱立達(dá)電子股份有限公司，廣東 廣州 511356

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基金項(xiàng)目:

R & D Projects in Key Fields of Guangdong Province (2020B0109380001; 2019B040403004; 2019B040403006); Science and Technology Planning Project of Guangxi Zhuang Autonomous Region (No. AA18118034); National Natural Science Foundation of China (Grant No. 51577070 and U1601208); Science and Technology Program of Guangzhou (No. 201704030095).


Composition-Driven Phase Transition and Electrical Perfor-mances of 0.74BiFe1- x Ga x O3-0.26BaTiO3 High Temperature Lead-Free Piezoceramics
Author:
Affiliation:

1.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2.Guangzhou Kailitech Electronics Co., Ltd, Guangzhou 511356, China

Fund Project:

R&D Projects in Key Fields of Guangdong Province (2020B0109380001, 2019B040403004, 2019B040403006); Science and Technology Planning Project of Guangxi Zhuang Autonomous Region (AA18118034); National Natural Science Foundation of China (51577070, U1601208); Science and Technology Program of Guangzhou (201704030095)

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    摘要:

    準(zhǔn)同型相界（MPB）對提升壓電陶瓷的壓電性能具有重要的作用。BiFeO3-BaTiO3體系的準(zhǔn)同型相界通常位于0.70BiFeO3-0.30BaTiO3組分附近。然而，對于BiFeO3-BaTiO3體系，BaTiO3含量越高其居里溫度越低。因此，在較低的BaTiO3含量組分附近構(gòu)建準(zhǔn)同型相界是使其同時獲得良好的壓電活性和高居里溫度的有效策略。采用固相法制備了0.74BiFe1-xGaxO3-0.26BaTiO3（x=0~0.05）系列無鉛壓電陶瓷，研究了Ga含量對其物相結(jié)構(gòu)與電性能的影響。結(jié)果表明：隨著Ga含量的增加，陶瓷樣品從三方相逐漸向贗立方相轉(zhuǎn)變。當(dāng)x≤0.01，陶瓷樣品為三方相結(jié)構(gòu)；而當(dāng)0.04≤x≤0.05，陶瓷樣品為贗立方結(jié)構(gòu)，在0.02≤x≤0.03形成了準(zhǔn)同型相界（三方-贗立方）。另外，由于容忍因子的升高，該系列陶瓷的居里溫度隨著Ga含量的增加而略有降低。位于準(zhǔn)同型附近的陶瓷樣品表現(xiàn)出良好的壓電活性和較高的居里溫度。

    Abstract:

    Morphotropic phase boundary (MPB) is very important for enhancing piezoelectric properties of piezoceramics. In general, the MPB of BiFeO3-BaTiO3 system ceramics locates near the composition of 0.70BiFeO3-0.30BaTiO3. However, higher content of BaTiO3 will lead to lower Curie temperature of BiFeO3-BaTiO3 ceramics. Therefore, constructing an MPB for BiFeO3-BaTiO3 ceramics with lower BaTiO3 content is a reasonable strategy to obtain both the good piezoelectric property and high Curie temperature. 0.74BiFe1-xGaxO3-0.26BaTiO3 (x=0~0.05) lead-free piezoceramics were fabricated by traditional sintering methods, and effect of Ga content on the structures and electrical performances was investigated. Results show that a composition-driven phase transition from rhombohedral (R) to pseudocubic (pC) is identified as x increases from 0 to 0.05. The ceramics show symmetries of R at x≤0.01 and pC at 0.04≤x≤0.05, and the MPB with R-pC coexistence is detected in the composition range of 0.02≤x≤0.03. The Curie temperature of the piezoceramics decreases slightly owing to increased tolerance factor t with the increment of Ga content. In particular, the high Curie temperature ~515 °C and improved piezoelectric property of piezoelectric coefficient d33 of ~127 pC/N are obtained in the ceramics near MPB.

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易文斌,盧振亞,劉興悅,黃都,賈智,陳志武,王歆,朱惠祥.0.74BiFe1- x Ga x O3-0.26BaTiO3 高溫?zé)o鉛壓電陶瓷的相變行為及電性能[J].稀有金屬材料與工程,2022,51(2):374~377.[Yi Wenbin, Lu Zhenya, Liu Xingyue, Huang Du, Jia Zhi, Chen Zhiwu, Wang Xin, Zhu Huixiang. Composition-Driven Phase Transition and Electrical Perfor-mances of 0.74BiFe1- x Ga x O3-0.26BaTiO3 High Temperature Lead-Free Piezoceramics[J]. Rare Metal Materials and Engineering,2022,51(2):374~377.]
DOI：10.12442/j. issn.1002-185X.20210623

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  • 收稿日期:2021-07-14
  • 最后修改日期:2021-09-28
  • 錄用日期:2021-10-27
  • 在線發(fā)布日期: 2022-03-03
  • 出版日期: 2022-02-28