Synthesis and dielectric properties of Ba1-xR2x/3Nb2O6 (R: Rare earth) with tetragonal tungsten bronze structure

Naoki Wakiya; Jui Kai Wang; Atsushi Saiki; Kazuo Shinozaki; Nobuyasu Mizutani

doi:10.1016/s0955-2219(98)00376-8

Synthesis and dielectric properties of Ba_1-xR_2x/3Nb₂O₆ (R: Rare earth) with tetragonal tungsten bronze structure

Naoki Wakiya, Jui Kai Wang, Atsushi Saiki, Kazuo Shinozaki, Nobuyasu Mizutani^*

^*Corresponding author for this work

Materials Design and Engineering

Research output: Contribution to journal › Article › peer-review

149 Scopus citations

Abstract

A series of new compounds, Ba_1-xR_2x/3Nb₂O₆ (R=Nd, Eu, Gd, Tb, Dy, Ho and Er) with tetragonal tungsten bronze (TTB) structure were synthesized. For Ba-R-Nb-O system, single phase TTB was obtained when X=0·25. To understand the formation condition of these TTB type compounds, two tolerance factors for TTB, t_A1 and t_A2, were proposed against the coordination polyhedra around A1 and A2 site cations, respectively. One of the factors was at least a requisition to stabilize crystal structure for all TTB type compounds. Ba_1-xR_2x/3Nb₂O₆ showed ferroelectric characteristics and the Curie temperature, T_c, increased as the decrease of the ionic radius of rare earth cations. These new compounds have potential to be candidates to apply ferroelectric random access memory (FRAM).

Original language	English
Pages (from-to)	1071-1075
Number of pages	5
Journal	Journal of the European Ceramic Society
Volume	19
Issue number	6-7
DOIs	https://doi.org/10.1016/s0955-2219(98)00376-8
State	Published - 1999/06

Keywords

C. ferroelectric properties.
Tetragonal tungsten bronze

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/s0955-2219(98)00376-8

Cite this

@article{72255f3a9c774165bafbb1bf260059bd,

title = "Synthesis and dielectric properties of Ba1-xR2x/3Nb2O6 (R: Rare earth) with tetragonal tungsten bronze structure",

abstract = "A series of new compounds, Ba1-xR2x/3Nb2O6 (R=Nd, Eu, Gd, Tb, Dy, Ho and Er) with tetragonal tungsten bronze (TTB) structure were synthesized. For Ba-R-Nb-O system, single phase TTB was obtained when X=0·25. To understand the formation condition of these TTB type compounds, two tolerance factors for TTB, tA1 and tA2, were proposed against the coordination polyhedra around A1 and A2 site cations, respectively. One of the factors was at least a requisition to stabilize crystal structure for all TTB type compounds. Ba1-xR2x/3Nb2O6 showed ferroelectric characteristics and the Curie temperature, Tc, increased as the decrease of the ionic radius of rare earth cations. These new compounds have potential to be candidates to apply ferroelectric random access memory (FRAM).",

keywords = "C. ferroelectric properties., Tetragonal tungsten bronze",

author = "Naoki Wakiya and Wang, {Jui Kai} and Atsushi Saiki and Kazuo Shinozaki and Nobuyasu Mizutani",

year = "1999",

month = jun,

doi = "10.1016/s0955-2219(98)00376-8",

language = "英語",

volume = "19",

pages = "1071--1075",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier B.V.",

number = "6-7",

}

TY - JOUR

T1 - Synthesis and dielectric properties of Ba1-xR2x/3Nb2O6 (R: Rare earth) with tetragonal tungsten bronze structure

AU - Wakiya, Naoki

AU - Wang, Jui Kai

AU - Saiki, Atsushi

AU - Shinozaki, Kazuo

AU - Mizutani, Nobuyasu

PY - 1999/6

Y1 - 1999/6

N2 - A series of new compounds, Ba1-xR2x/3Nb2O6 (R=Nd, Eu, Gd, Tb, Dy, Ho and Er) with tetragonal tungsten bronze (TTB) structure were synthesized. For Ba-R-Nb-O system, single phase TTB was obtained when X=0·25. To understand the formation condition of these TTB type compounds, two tolerance factors for TTB, tA1 and tA2, were proposed against the coordination polyhedra around A1 and A2 site cations, respectively. One of the factors was at least a requisition to stabilize crystal structure for all TTB type compounds. Ba1-xR2x/3Nb2O6 showed ferroelectric characteristics and the Curie temperature, Tc, increased as the decrease of the ionic radius of rare earth cations. These new compounds have potential to be candidates to apply ferroelectric random access memory (FRAM).

AB - A series of new compounds, Ba1-xR2x/3Nb2O6 (R=Nd, Eu, Gd, Tb, Dy, Ho and Er) with tetragonal tungsten bronze (TTB) structure were synthesized. For Ba-R-Nb-O system, single phase TTB was obtained when X=0·25. To understand the formation condition of these TTB type compounds, two tolerance factors for TTB, tA1 and tA2, were proposed against the coordination polyhedra around A1 and A2 site cations, respectively. One of the factors was at least a requisition to stabilize crystal structure for all TTB type compounds. Ba1-xR2x/3Nb2O6 showed ferroelectric characteristics and the Curie temperature, Tc, increased as the decrease of the ionic radius of rare earth cations. These new compounds have potential to be candidates to apply ferroelectric random access memory (FRAM).

KW - C. ferroelectric properties.

KW - Tetragonal tungsten bronze

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U2 - 10.1016/s0955-2219(98)00376-8

DO - 10.1016/s0955-2219(98)00376-8

M3 - 学術論文

AN - SCOPUS:0032661946

SN - 0955-2219

VL - 19

SP - 1071

EP - 1075

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 6-7

ER -