Effect of rare-earth ionic radius on microstructure and electrical property of rare-earth zirconate ceramics

Xiaoliang Xia; Zhanguo Liu; Jiahu Ouyang; Yujun Jin

Effect of rare-earth ionic radius on microstructure and electrical property of rare-earth zirconate ceramics

Xiaoliang Xia
, Zhanguo Liu
, Jiahu Ouyang^*
, Yujun Jin

^*Corresponding author for this work

Harbin Institute of Technology
CAS - Qingdao Institute of Biomass Energy and Bioprocess Technology

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

3 Scopus citations

Abstract

The microstructure and electrical conductivity of A₂Zr₂O₇ ceramic have been investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) coupled with selected area electron diffraction (SAED), Raman spectroscopy and Impedance spectroscopy. The results show that the degree of structural order of rare-earth zirconates A₂Zr₂O₇ ceramics gradually decreases with reducing ionic radius of rare-earth cations. The Sm₂Zr₂O₇ and Eu₂Zr₂O₇ ceramics exhibit an ordered pyrochlore phase, while Gd₂Zr₂O₇ and Dy₂Zr₂O₇ ceramics have a disordered fluorite phase. Pyrochlore-type Eu₂Zr₂O₇ ceramic with a relatively low structural order degree shows the maximum grain conductivity of 1.03×10^-2 S·cm^-1 at 1173 K, as compared with that of other rare-earth zirconates.

Original language	English
Pages (from-to)	2003-2008
Number of pages	6
Journal	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume	45
Issue number	8
State	Published - 1 Aug 2016
Externally published	Yes

Keywords

Defective fluorite
Degree of structural order
Electrical conductivity
Microstructure
Pyrochlore

Cite this

@article{7c40d10894244b328c1d4fa5d308e272,

title = "Effect of rare-earth ionic radius on microstructure and electrical property of rare-earth zirconate ceramics",

abstract = "The microstructure and electrical conductivity of A2Zr2O7 ceramic have been investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) coupled with selected area electron diffraction (SAED), Raman spectroscopy and Impedance spectroscopy. The results show that the degree of structural order of rare-earth zirconates A2Zr2O7 ceramics gradually decreases with reducing ionic radius of rare-earth cations. The Sm2Zr2O7 and Eu2Zr2O7 ceramics exhibit an ordered pyrochlore phase, while Gd2Zr2O7 and Dy2Zr2O7 ceramics have a disordered fluorite phase. Pyrochlore-type Eu2Zr2O7 ceramic with a relatively low structural order degree shows the maximum grain conductivity of 1.03×10-2 S·cm-1 at 1173 K, as compared with that of other rare-earth zirconates.",

keywords = "Defective fluorite, Degree of structural order, Electrical conductivity, Microstructure, Pyrochlore",

author = "Xiaoliang Xia and Zhanguo Liu and Jiahu Ouyang and Yujun Jin",

year = "2016",

month = aug,

day = "1",

language = "英语",

volume = "45",

pages = "2003--2008",

journal = "Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering",

issn = "1002-185X",

publisher = "Science Press ",

number = "8",

}

TY - JOUR

T1 - Effect of rare-earth ionic radius on microstructure and electrical property of rare-earth zirconate ceramics

AU - Xia, Xiaoliang

AU - Liu, Zhanguo

AU - Ouyang, Jiahu

AU - Jin, Yujun

PY - 2016/8/1

Y1 - 2016/8/1

N2 - The microstructure and electrical conductivity of A2Zr2O7 ceramic have been investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) coupled with selected area electron diffraction (SAED), Raman spectroscopy and Impedance spectroscopy. The results show that the degree of structural order of rare-earth zirconates A2Zr2O7 ceramics gradually decreases with reducing ionic radius of rare-earth cations. The Sm2Zr2O7 and Eu2Zr2O7 ceramics exhibit an ordered pyrochlore phase, while Gd2Zr2O7 and Dy2Zr2O7 ceramics have a disordered fluorite phase. Pyrochlore-type Eu2Zr2O7 ceramic with a relatively low structural order degree shows the maximum grain conductivity of 1.03×10-2 S·cm-1 at 1173 K, as compared with that of other rare-earth zirconates.

AB - The microstructure and electrical conductivity of A2Zr2O7 ceramic have been investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) coupled with selected area electron diffraction (SAED), Raman spectroscopy and Impedance spectroscopy. The results show that the degree of structural order of rare-earth zirconates A2Zr2O7 ceramics gradually decreases with reducing ionic radius of rare-earth cations. The Sm2Zr2O7 and Eu2Zr2O7 ceramics exhibit an ordered pyrochlore phase, while Gd2Zr2O7 and Dy2Zr2O7 ceramics have a disordered fluorite phase. Pyrochlore-type Eu2Zr2O7 ceramic with a relatively low structural order degree shows the maximum grain conductivity of 1.03×10-2 S·cm-1 at 1173 K, as compared with that of other rare-earth zirconates.

KW - Defective fluorite

KW - Degree of structural order

KW - Electrical conductivity

KW - Microstructure

KW - Pyrochlore

UR - https://www.scopus.com/pages/publications/84985914886

M3 - 文章

AN - SCOPUS:84985914886

SN - 1002-185X

VL - 45

SP - 2003

EP - 2008

JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering

IS - 8

ER -

Effect of rare-earth ionic radius on microstructure and electrical property of rare-earth zirconate ceramics

Abstract

Keywords

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