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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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

Received: 18 March 2020 Published: 11 August 2020

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	PENG Congfei
	HUANG Rongxia
	LI Jiajiu
	XIONG Shunjin
	LIN Huatai

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PENG Congfei,HUANG Rongxia,LI Jiajiu, et al. Effect of B-site Hf doping on the structure and properties of 0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 221-226.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I3/221

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