High dielectric tunability, electrostriction strain and electrocaloric strength at a tricritical point of tetragonal, rhombohedral and pseudocubic phases

JOURNAL OF ALLOYS AND COMPOUNDS

卷:646

Article

Peng, Biaolin^1,2,3  Zhang, Qi^4,5  Li, Xing³  Sun, Tieyu³  Ke, Shanming¹  Ye, Mao^1,2  Wang, Yu³  Lu, Wei³  Niu, Hanben²  Zeng, Xierong¹  Fan, Huiqing⁶  Huang, Haitao³ 

[1] Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen Key Lab Special Funct Mat, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China

[3] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China

[4] Cranfield Univ, Dept Mfg & Mat, Cranfield MK43 0AL, Beds, England

[5] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China

[6] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

关键词: Dielectric tenability;    Electrostriction;    Electrocaloric;    Relaxor;    Morphotropic phase boundary;   

DOI  :  10.1016/j.jallcom.2015.05.133

来源: Elsevier

【 摘 要 】

A relaxor ferroelectric Pb(Ni1/3Nb2/3)(0.5)Zr0.15Ti0.35O3 (PNNZT) ceramic was reported, designed upon an idea that the composition is selected to near a tricritical point of tetragonal, rhombohedral and pseudocubic phases. High dielectric tunability of 67%, simultaneously with high electrostriction strain of 0.319% and high electrocaloric strength (Delta T/Delta E) of 32.5 mK cm/kV are achieved, which make it a promising multifunctional material for applications in dielectric tunable, precisely controlled and electric refrigeration devices. This is endowed by the low energy barrier among the transitions of phases and strong relaxor ferroelectric activities around the tricritical point. This work provides a guide for the design of multifunctional ferroelectric materials and can promote the development of other multifunctional ferroic materials. (C) 2015 Elsevier B.V. All rights reserved.

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