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Title: Phase coexistence and high electrical properties in (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} piezoelectric ceramics

Abstract

(K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} lead-free piezoelectric ceramics were produced by conventional solid-state reaction method. The effects of K/Na ratio on the phase transitional behavior, Raman spectrum, microstructure, and dielectric, piezoelectric, and ferroelectric properties of the ceramics have been investigated. The phase structure of the ceramics undergoes a transition from orthorhombic to tetragonal phase with increasing x. A double-degenerate symmetric O-Nb-O stretching vibration v{sub 1} and a triply degenerate symmetric O-Nb-O bending vibration v{sub 5} are detected as relatively strong scattering in the Raman spectra. The peak shifts of v{sub 5} and v{sub 1} modes all have a discontinuity with x between 0.42 and 0.46, which may suggest the coexistence of orthorhombic and tetragonal phases in this range. Properly modifying x reduces the sintering temperature, promotes the grain growth behavior, and improves the density of the ceramics. The polymorphic phase transition (at T{sub o-t}) is shifted to near room temperature by increasing x to 0.44 (K/Na ratio of about 0.85:1), and the coexistence of orthorhombic and tetragonal phases in the ceramics at x=0.44 results in the optimized electrical properties (d{sub 33}=291 pC/N, k{sub p}=0.54, {epsilon}{sub r}=1167, tan {delta}=0.018, T{sub o-t}=35 deg. C, T{sub C}=351 deg. C, P{sub r}=27.65more » {mu}C/cm{sup 2}, and E{sub c}=8.63 kV/cm). The results show that the equal K/Na ratio is not an essential condition in obtaining optimized electrical properties in (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} ceramics.« less

Authors:
; ; ; ;  [1]
  1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an, 710062 Shaanxi (China)
Publication Date:
OSTI Identifier:
21190062
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 105; Journal Issue: 5; Other Information: DOI: 10.1063/1.3081643; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; ELECTRIC CONDUCTIVITY; FERROELECTRIC MATERIALS; GRAIN GROWTH; LITHIUM COMPOUNDS; MICROSTRUCTURE; NIOBATES; ORTHORHOMBIC LATTICES; PERMITTIVITY; PHASE TRANSFORMATIONS; PIEZOELECTRICITY; POTASSIUM COMPOUNDS; RAMAN SPECTRA; SCATTERING; SINTERING; SODIUM COMPOUNDS; TANTALATES; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Yunfei, Chang, Zupei, Yang, Difei, Ma, Zonghuai, Liu, and Zenglin, Wang. Phase coexistence and high electrical properties in (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} piezoelectric ceramics. United States: N. p., 2009. Web. doi:10.1063/1.3081643.
Yunfei, Chang, Zupei, Yang, Difei, Ma, Zonghuai, Liu, & Zenglin, Wang. Phase coexistence and high electrical properties in (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} piezoelectric ceramics. United States. https://doi.org/10.1063/1.3081643
Yunfei, Chang, Zupei, Yang, Difei, Ma, Zonghuai, Liu, and Zenglin, Wang. Sun . "Phase coexistence and high electrical properties in (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} piezoelectric ceramics". United States. https://doi.org/10.1063/1.3081643.
@article{osti_21190062,
title = {Phase coexistence and high electrical properties in (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} piezoelectric ceramics},
author = {Yunfei, Chang and Zupei, Yang and Difei, Ma and Zonghuai, Liu and Zenglin, Wang},
abstractNote = {(K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} lead-free piezoelectric ceramics were produced by conventional solid-state reaction method. The effects of K/Na ratio on the phase transitional behavior, Raman spectrum, microstructure, and dielectric, piezoelectric, and ferroelectric properties of the ceramics have been investigated. The phase structure of the ceramics undergoes a transition from orthorhombic to tetragonal phase with increasing x. A double-degenerate symmetric O-Nb-O stretching vibration v{sub 1} and a triply degenerate symmetric O-Nb-O bending vibration v{sub 5} are detected as relatively strong scattering in the Raman spectra. The peak shifts of v{sub 5} and v{sub 1} modes all have a discontinuity with x between 0.42 and 0.46, which may suggest the coexistence of orthorhombic and tetragonal phases in this range. Properly modifying x reduces the sintering temperature, promotes the grain growth behavior, and improves the density of the ceramics. The polymorphic phase transition (at T{sub o-t}) is shifted to near room temperature by increasing x to 0.44 (K/Na ratio of about 0.85:1), and the coexistence of orthorhombic and tetragonal phases in the ceramics at x=0.44 results in the optimized electrical properties (d{sub 33}=291 pC/N, k{sub p}=0.54, {epsilon}{sub r}=1167, tan {delta}=0.018, T{sub o-t}=35 deg. C, T{sub C}=351 deg. C, P{sub r}=27.65 {mu}C/cm{sup 2}, and E{sub c}=8.63 kV/cm). The results show that the equal K/Na ratio is not an essential condition in obtaining optimized electrical properties in (K{sub x}Na{sub 0.96-x}Li{sub 0.04})(Nb{sub 0.85}Ta{sub 0.15})O{sub 3} ceramics.},
doi = {10.1063/1.3081643},
url = {https://www.osti.gov/biblio/21190062}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 5,
volume = 105,
place = {United States},
year = {2009},
month = {3}
}