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Title: Evolution of structure in Na 0.5 Bi 0.5 TiO 3 single crystals with BaTiO 3

Abstract

The structural, dielectric, and piezoelectric properties of Na0.5Bi0.5TiO3-x mol. %BaTiO3 (NBT-x%BT) crystals have been investigated. The dielectric and piezoelectric properties of NBT-x%BT were enhanced near x¼5–7. High resolution synchrotron x-ray powder diffraction studies revealed the presence of a phase boundary between monoclinic (Cc) and tetragonal (P4bm) phases near x¼5–7, where the dielectric and piezoelectric properties were enhanced.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
OSTI Identifier:
1392350
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 16
Country of Publication:
United States
Language:
English
Subject:
FREE PIEZOELECTRIC CERAMICS; LEAD-FREE PIEZOCERAMICS; MONOCLINIC PHASE; PEROVSKITES; POLARIZATION ROTATION

Citation Formats

Ge, Wenwei, Luo, Chengtao, Zhang, Qinhui, Ren, Yang, Li, Jiefang, Luo, Haosu, and Viehland, D. Evolution of structure in Na 0.5 Bi 0.5 TiO 3 single crystals with BaTiO 3. United States: N. p., 2014. Web. doi:10.1063/1.4900547.
Ge, Wenwei, Luo, Chengtao, Zhang, Qinhui, Ren, Yang, Li, Jiefang, Luo, Haosu, & Viehland, D. Evolution of structure in Na 0.5 Bi 0.5 TiO 3 single crystals with BaTiO 3. United States. doi:10.1063/1.4900547.
Ge, Wenwei, Luo, Chengtao, Zhang, Qinhui, Ren, Yang, Li, Jiefang, Luo, Haosu, and Viehland, D. Mon . "Evolution of structure in Na 0.5 Bi 0.5 TiO 3 single crystals with BaTiO 3". United States. doi:10.1063/1.4900547.
@article{osti_1392350,
title = {Evolution of structure in Na 0.5 Bi 0.5 TiO 3 single crystals with BaTiO 3},
author = {Ge, Wenwei and Luo, Chengtao and Zhang, Qinhui and Ren, Yang and Li, Jiefang and Luo, Haosu and Viehland, D.},
abstractNote = {The structural, dielectric, and piezoelectric properties of Na0.5Bi0.5TiO3-x mol. %BaTiO3 (NBT-x%BT) crystals have been investigated. The dielectric and piezoelectric properties of NBT-x%BT were enhanced near x¼5–7. High resolution synchrotron x-ray powder diffraction studies revealed the presence of a phase boundary between monoclinic (Cc) and tetragonal (P4bm) phases near x¼5–7, where the dielectric and piezoelectric properties were enhanced.},
doi = {10.1063/1.4900547},
journal = {Applied Physics Letters},
number = 16,
volume = 105,
place = {United States},
year = {Mon Oct 20 00:00:00 EDT 2014},
month = {Mon Oct 20 00:00:00 EDT 2014}
}
  • The structural, dielectric, and piezoelectric properties of Na{sub 0.5}Bi{sub 0.5}TiO{sub 3}-x mol. %BaTiO{sub 3} (NBT-x%BT) crystals have been investigated. The dielectric and piezoelectric properties of NBT-x%BT were enhanced near x = 5–7. High resolution synchrotron x-ray powder diffraction studies revealed the presence of a phase boundary between monoclinic (Cc) and tetragonal (P4bm) phases near x = 5–7, where the dielectric and piezoelectric properties were enhanced.
  • Lead free pervoskite 0.80 Na{sub 0.5} Bi{sub 0.5} TiO{sub 3}-0.16 K{sub 0.5} Bi{sub 0.5} TiO{sub 3}-0.04 BaTiO{sub 3} (NKBBT) ceramics were fabricated via conventional solid state processing technique sintered at 1200 °C and their crystal structures and electrical properties were systematically studied. Structure of the prepared NKBBT ceramics was confirmed by Powder X-ray diffraction analysis. The dependence of dielectric constant on temperature for various frequencies (100 Hz-100 KHz) has been determined. The diffuse transition is observed in the variation of dielectric constant and it provides evidence for the relaxor characteristics. The ferroelectric response of the NKBBT ceramics with different frequencymore » was studied. Polarisation electric field hysteresis loops revealed that the remnant polarization is 6.88 µC/cm{sup 2} and coercive electric field is 66.42 kV/cm.« less
  • Lead-free piezoelectric ceramics (1-x-y)Bi{sub 0.5}Na{sub 0.5}TiO{sub 3}-xBaTiO{sub 3}-yK{sub 0.5}Na{sub 0.5}NbO{sub 3} (0.05{<=}x{<=}0.07 and 0.01{<=}y{<=}0.03), have been synthesized by a conventional solid state sintering method. The room temperature ferroelectric and piezoelectric properties of these ceramics were studied. Based on the measured properties, the ceramics were categorized into two groups: group I compositions having dominant ferroelectric order and group II compositions displaying mixed ferroelectric and antiferroelectric properties at room temperature. A composition from group II near the boundary between these two groups exhibited a strain as large as {approx}0.45% at an electric field of 8 kV/mm. Polarization in this composition was notmore » stable in that the piezoelectric coefficient d{sub 33} at zero electric field was only about 30 pm/V. The converse piezoelectric response becomes weaker when the composition deviated from the boundary between the groups toward either the ferroelectric or antiferroelectric compositions. These results were rationalized based on a field induced antiferroelectric-ferroelectric phase transition.« less
  • Bi deficient, Mn doped 0.92(Na{sub 0.5}Bi{sub 0.5})TiO{sub 3}-0.08(K{sub 0.5}Bi{sub 0.5})TiO{sub 3} single crystals were grown by carefully controlled top-seeded solution growth method. Local structures were investigated by transmission electron microscopy. The site occupation and valence state of manganese were characterized by electron paramagnetic resonance spectrum. The leakage current density in the as-grown single crystals is effectively depressed. The introduced defect complexes suppress the temperature induced phase transformation, increasing the depolarization temperature (165 °C) and thermal stability of ferroelectric properties.
  • High-resolution x-ray and neutron diffraction of (0.96)Na 0.5Bi 0.5TiO 3–(0.04)BaTiO 3 (NBT-4BT) reveal subtle structural distortions that evidence lower symmetry than allowed in the R3c space group. The combined refinement that best models the diffraction patterns is a two phase mixture of a monoclinic Cc phase and a minor fraction of a metrically cubic Pm 3¯ m phase (13 wt. %). The cubic phase is utilized to account for nanometer-scale regions whose local deviations from the long-range symmetry are not observed, such as polar nano-regions or tetragonal platelets. This suggests that the low symmetry found in the NBT-rich phases extendsmore » from 0 at. % to at least 4 at. % BT.« less