Improved Curie Temperature of Li-Doped Lead-Free (K,Na)NbO3 Ceramics Analysis

Rui Zhu Zhang; Wen Peng Guo; Gao Lei Zhao

doi:10.4028/www.scientific.net/AMR.1061-1062.91

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1061-1062Improved Curie Temperature of Li-Doped Lead-Free...

Improved Curie Temperature of Li-Doped Lead-Free (K,Na)NbO₃ Ceramics Analysis

Abstract:

(K,Na)NbO₃(KNN)-based lead-free piezoelectric ceramic could be fabricated by ordinary solid sintering method.This paper reported preferable properties of solid solutions (1-x)(Na_0.535K_0.480)NbO₃-xLiNbO₃ (x=0.050,0.055,0.060,0.065 and 0.070 successively) all sintered at 1060°C.The nonconservation of charge suppressed negative effects caused by evaporations of K&Na and doped Li occupied A sites in ABO₃ perovskite structure lattices led to the intensification of lattice distortion.XRD result showd phase transition from coexistence of orthorhombic and tetragonal symmetry to tetragonal.Polymorphic phase boundary could be observed when 0.050≤ x≤ 0.060.Coexistence of orthorhombic and tetragonal phases brought improvements of piezoelectric coefficient d₃₃and electromechanical coupling factor kp,whose top values were 162 pC/N and 28.1% in this paper. Positive correlation between the Curie temperature and Li content proved that a distorted crystal lattice needed more energy to accomplish its phase transition from tetragonal to cubic than a normal one.

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Advanced Materials Research (Volumes 1061-1062)

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91-95

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1061-1062.91

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Online since:

December 2014

Authors:

Rui Zhu Zhang, Wen Peng Guo, Gao Lei Zhao

Keywords:

High Curie Temperature, Crystal Structure, KNN Basd Lead-Free Piezoelectric Ceramics, Phase Transition

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