Influence of La2O3 addition on thermophysical properties of ZrO2-4 mol%Y2O3 ceramics fabricated by spark plasma sintering

Byung Koog Jang; Seongwon Kim; Yoon Suk Oh; Hyung Tae Kim; Yoshio Sakka; Hideyuki Murakami

doi:10.2109/jcersj2.119.929

Influence of La₂O₃ addition on thermophysical properties of ZrO₂-4 mol%Y2O3 ceramics fabricated by spark plasma sintering

Byung Koog Jang^*, Seongwon Kim, Yoon Suk Oh, Hyung Tae Kim, Yoshio Sakka, Hideyuki Murakami

^*Corresponding author for this work

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

8 Citations (Scopus)

Abstract

The influence of La₂O₃ addition on the thermal diffusivity and thermal conductivity of ZrO₂ ceramics has been investigated. Porous and dense ZrO₂ ceramics were fabricated by spark plasma sintering at 1100 and 1500°C. The porosity of ZrO₂ ceramics sintered at 1100°C increased with increasing 05 mol% La ₂O₃ addition. In contrast, ZrO₂ ceramics sintered at 1500°C showed full density regardless of the amount of La ₂O₃ addition. The La₂Zr₂O ₇ of crystalline pyrochlore phase was formed by reaction between La₂O₃ and ZrO₂. The XRD peak of the La ₂Zr₂O₇ phase increased with increasing La ₂O₃ addition. The thermal diffusivity and thermal conductivity of sintered ZrO₂ decreased with increasing La ₂O₃ addition. In addition, the thermal conductivity of the present samples decreased remarkably with increasing the porosity.

Original language	English
Pages (from-to)	929-932
Number of pages	4
Journal	Journal of the Ceramic Society of Japan
Volume	119
Issue number	1396
DOIs	https://doi.org/10.2109/jcersj2.119.929
Publication status	Published - 2011 Dec
Externally published	Yes

Keywords

Thermal conductivity

ASJC Scopus subject areas

Ceramics and Composites
Chemistry(all)
Condensed Matter Physics
Materials Chemistry

Access to Document

10.2109/jcersj2.119.929

Cite this

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title = "Influence of La2O3 addition on thermophysical properties of ZrO2-4 mol%Y2O3 ceramics fabricated by spark plasma sintering",

abstract = "The influence of La2O3 addition on the thermal diffusivity and thermal conductivity of ZrO2 ceramics has been investigated. Porous and dense ZrO2 ceramics were fabricated by spark plasma sintering at 1100 and 1500°C. The porosity of ZrO2 ceramics sintered at 1100°C increased with increasing 05 mol% La 2O3 addition. In contrast, ZrO2 ceramics sintered at 1500°C showed full density regardless of the amount of La 2O3 addition. The La2Zr2O 7 of crystalline pyrochlore phase was formed by reaction between La2O3 and ZrO2. The XRD peak of the La 2Zr2O7 phase increased with increasing La 2O3 addition. The thermal diffusivity and thermal conductivity of sintered ZrO2 decreased with increasing La 2O3 addition. In addition, the thermal conductivity of the present samples decreased remarkably with increasing the porosity.",

keywords = "Thermal conductivity",

author = "Jang, {Byung Koog} and Seongwon Kim and Oh, {Yoon Suk} and Kim, {Hyung Tae} and Yoshio Sakka and Hideyuki Murakami",

year = "2011",

month = dec,

doi = "10.2109/jcersj2.119.929",

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AU - Jang, Byung Koog

AU - Kim, Seongwon

AU - Oh, Yoon Suk

AU - Kim, Hyung Tae

AU - Sakka, Yoshio

AU - Murakami, Hideyuki

PY - 2011/12

Y1 - 2011/12

N2 - The influence of La2O3 addition on the thermal diffusivity and thermal conductivity of ZrO2 ceramics has been investigated. Porous and dense ZrO2 ceramics were fabricated by spark plasma sintering at 1100 and 1500°C. The porosity of ZrO2 ceramics sintered at 1100°C increased with increasing 05 mol% La 2O3 addition. In contrast, ZrO2 ceramics sintered at 1500°C showed full density regardless of the amount of La 2O3 addition. The La2Zr2O 7 of crystalline pyrochlore phase was formed by reaction between La2O3 and ZrO2. The XRD peak of the La 2Zr2O7 phase increased with increasing La 2O3 addition. The thermal diffusivity and thermal conductivity of sintered ZrO2 decreased with increasing La 2O3 addition. In addition, the thermal conductivity of the present samples decreased remarkably with increasing the porosity.

AB - The influence of La2O3 addition on the thermal diffusivity and thermal conductivity of ZrO2 ceramics has been investigated. Porous and dense ZrO2 ceramics were fabricated by spark plasma sintering at 1100 and 1500°C. The porosity of ZrO2 ceramics sintered at 1100°C increased with increasing 05 mol% La 2O3 addition. In contrast, ZrO2 ceramics sintered at 1500°C showed full density regardless of the amount of La 2O3 addition. The La2Zr2O 7 of crystalline pyrochlore phase was formed by reaction between La2O3 and ZrO2. The XRD peak of the La 2Zr2O7 phase increased with increasing La 2O3 addition. The thermal diffusivity and thermal conductivity of sintered ZrO2 decreased with increasing La 2O3 addition. In addition, the thermal conductivity of the present samples decreased remarkably with increasing the porosity.

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