Effect of Ionic Pair (Nb5+-Cr3+) Doping on Microstructure and Electrical Properties of 0.93Bi0.5Na0.5TiO3-0.07BaTiO3 Ceramics

Abstract

Abstract: A new promising lead-free piezoelectric ceramics (Bi_0.5Na_0.5)_0.93Ba_0.07Ti_1-x(Nb_0.5Cr_0.5)_xO₃ (mole fraction x=0%, 0.5%, 1%, 2%, 2.5%, 5%) (abbreviated as BNBT-xNC) were prepared by the conventional solid-phase synthesis method. The effect of ionic pair (Nb⁵⁺-Cr³⁺) on microstructures, dielectric properties, and ferroelectric properties as well as strain properties of 0.93Bi_0.5Na_0.5TiO₃-0.07BaTiO₃ (abbreviated as BNT-7BT) ceramics was systematically investigated. The results show that all composition exhibits a single pseudo-cubic structure. The electrical properties reveal that the ferroelectric relaxor characteristics of BNBT-xNC ceramics change significantly with different ionic pair (Nb⁵⁺-Cr³⁺) substitution. The increasing ionic pair (Nb⁵⁺-Cr³⁺) modification induces two transitions from non-ergodic relaxor state (0%≤x≤1%) to coexistence of non-ergodic-ergodic relaxor state (1%≤x≤2%), and finally to ergodic relaxor state (2.5%≤x≤5%). The ionic pair (Nb⁵⁺-Cr³⁺) modification induces BNBT-xNC ceramics transition from ferroelectric state to relaxor state, and strain properties first increase and then decrease. A low dose of ionic pair (Nb⁵⁺-Cr³⁺) substitution enhances the strain propertites of BNBT-xNC ceramics, and the BNBT-xNC ceramics with x=2% exhibits the maximum strain (S_max=0.22%) and inverse piezoelectric constant (d^*₃₃=431 pm/V). The evolution of electrical properties associates with micostucture, which provides a new sight to investigate the effect of the ionic pair doping on BNT-BT ceramics.

Key words: BNT-BT ceramics, ionic pair doping, microstructure, dielectric property, ferroelectric property, strain property

CLC Number:

TQ174

CHEN Pei, ZHOU Changrong. Effect of Ionic Pair (Nb⁵⁺-Cr³⁺) Doping on Microstructure and Electrical Properties of 0.93Bi_0.5Na_0.5TiO₃-0.07BaTiO₃ Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 970-977.

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Effect of Ionic Pair (Nb⁵⁺-Cr³⁺) Doping on Microstructure and Electrical Properties of 0.93Bi_0.5Na_0.5TiO₃-0.07BaTiO₃ Ceramics

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