B位Hf掺杂对0.94Bi0.5Na0.5TiO3-0.06BaTiO3陶瓷结构与性能的影响

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摘要以HfO₂的形式将Hf元素掺杂到BNBT陶瓷中,采用固相烧结法制备(Bi_0.5Na_0.5)_0.94Ba_0.06Ti_1-0.01_xHf_0.01_xO₃(100BNBT-xHf,x=0~2.0,摩尔分数)无铅陶瓷,系统研究Hf掺杂对100BNBT-xHf陶瓷晶体结构、显微结构和电学性能的影响。结果表明,所有100BNBT-xHf陶瓷均处于准同型相界区,为纯钙钛矿结构。添加少量HfO₂可有效地促进100BNBT-xHf陶瓷的晶粒长大,100BNBT-1.0Hf的平均晶粒尺寸达到2.30 μm。从室温环境下测量的电滞回线中发现,随HfO₂含量增加,该100BNBT-xHf陶瓷从正常铁电相变为弛豫铁电相再转变为顺电相,其中的 100BNBT-1.0Hf表现出优异的铁电性,而100BNBT-2.0Hf陶瓷则具有良好的储能特性,储能效率达到38.23%;在电致应变方面,100BNBT-1.0Hf陶瓷具有高电场应变和大逆压电常数,分别为0.35%和583 pm/V。

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	彭聪斐
	黄荣厦
	黎家就
	熊顺进
	林华泰

关键词 ： BNT-BT, Hf掺杂, 场致应变, B位掺杂, 固相烧结

Abstract：A series of HfO₂-modified (Bi_0.5Na_0.5)_0.94Ba_0.06Ti_1-_xHf_xO₃(100BNBT-xHf, x=0-2.0, mole fraction) ceramics were prepared by solid state sintering method, and Hf element was doped into BNBT ceramics in the form of HfO₂. The effects of Hf element on crystal structure, microstructure and electrical properties of 100BNBT-xHf samples were analyzed systematically. The results show that all 100BNBT-xHf ceramics with pure perovskite structure were near the morphotropic phase boundary. The addition of Hf can promote the grain growth of 100BNBT-xHf, and the average grain size of 100BNBT-1.0Hf were reached 2.30 μm. With the increase of Hf⁴⁺ content, the ceramic changed from normal ferroelectric phase to relaxor ferroelectric phase and then to paraelectric phase at room temperature. The 100BNBT-1.0Hf showed the best excellent ferroelectricity, while the 100BNBT-2.0Hf ceramics displayed the best energy storage characteristics, and the energy storage efficiency reached 38.23%. In terms of field-induced strain, a large electro-strain of 0.35% and a large piezoelectric coefficient of 583 pm/V were obtained at x=1.0.

Key words： BNT-BT Hf doping electro-strain B-site doping solid state sintering

收稿日期: 2020-03-18 出版日期: 2020-08-11

ZTFLH:

TQ174

基金资助:国家自然科学基金资助项目(51772204); 广东高技术陶瓷创新团队项目(2013G061)

通讯作者: 黄荣厦,副教授,博士。电话：18620203995;E-mail: 9319484@qq.com

引用本文:

彭聪斐, 黄荣厦, 黎家就, 熊顺进, 林华泰. B位Hf掺杂对0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃陶瓷结构与性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(3): 221-226.
PENG Congfei, HUANG Rongxia, LI Jiajiu, XIONG Shunjin, LIN Huatai. Effect of B-site Hf doping on the structure and properties of 0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ ceramics. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 221-226.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I3/221

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