In-situ powder X-ray diffraction investigation of reaction pathways for the BaCO3-CeO2-In2O3 and CeO 2-In2O3 systems

Surinderjit Singh Bhella; Shahid P. Shafi; Francesca Trobec; Mario Bieringer; Venkataraman Thangadurai

doi:10.1021/ic902104r

In-situ powder X-ray diffraction investigation of reaction pathways for the BaCO₃-CeO₂-In₂O₃ and CeO ₂-In₂O₃ systems

Surinderjit Singh Bhella, Shahid P. Shafi, Francesca Trobec, Mario Bieringer, Venkataraman Thangadurai^*

^*Corresponding author for this work

School of Chemistry

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

Abstract

We report the first in-situ powder X-ray diffraction (PXRD) study of the BaCO₃-CeO₂-In₂O₃ and CeO ₂-In₂O₃ systems in air over a wide range of temperature between 25 and 1200 ° C. Herein, we are investigating the formation pathway and chemical stability of perovskite-type BaCe _1-xIn_xO_3-δ (x = 0.1, 0.2, and 0.3) and corresponding fluorite-type Ce_1-xIn_xO_2-δ phases. The potential direct solid state reaction between CeO₂ and In₂O₃ for the formation of indium-doped fluorite-type phase is not observed even up to 1200 ° C in air. The formation of the BaCe_1-xIn_xO_3-δ perovskite structures was investigated and rationalized using in-situ PXRD. Furthermore the decomposition of the indium-doped perovskites in CO₂ is followed using high temperature diffraction and provides insights into the reaction pathway as well as the thermal stability of the Ce_1-xInxO_3-δ system. In CO₂ flow, BaCe_1-xIn_xO_3-δ decomposes above T = 600 ° C into BaCO₃ and Ce _1-xIn_xO_2-δ. Furthermore, for the first time, the in-situ PXRD confirmed that Ce_1-xIn_xO _2-δ decomposes above 800 ° C and supported the previously claimed metastability. The maximum In-doping level for CeO₂ has been determined using PXRD. The lattice constant of the fluorite-type structure Ce_1-xIn_xO_2-δ follows the Shannon ionic radii trend, and crystalline domain sizes were found to be dependent on indium concentration.

Original language	English
Pages (from-to)	1699-1704
Number of pages	6
Journal	Inorganic Chemistry
Volume	49
Issue number	4
DOIs	https://doi.org/10.1021/ic902104r
Publication status	Published - 15 Feb 2010

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@article{8a28706c1f9640f8847d3410ef024612,

title = "In-situ powder X-ray diffraction investigation of reaction pathways for the BaCO3-CeO2-In2O3 and CeO 2-In2O3 systems",

abstract = "We report the first in-situ powder X-ray diffraction (PXRD) study of the BaCO3-CeO2-In2O3 and CeO 2-In2O3 systems in air over a wide range of temperature between 25 and 1200 ° C. Herein, we are investigating the formation pathway and chemical stability of perovskite-type BaCe 1-xInxO3-δ (x = 0.1, 0.2, and 0.3) and corresponding fluorite-type Ce1-xInxO2-δ phases. The potential direct solid state reaction between CeO2 and In2O3 for the formation of indium-doped fluorite-type phase is not observed even up to 1200 ° C in air. The formation of the BaCe1-xInxO3-δ perovskite structures was investigated and rationalized using in-situ PXRD. Furthermore the decomposition of the indium-doped perovskites in CO2 is followed using high temperature diffraction and provides insights into the reaction pathway as well as the thermal stability of the Ce1-xInxO3-δ system. In CO2 flow, BaCe1-xInxO3-δ decomposes above T = 600 ° C into BaCO3 and Ce 1-xInxO2-δ. Furthermore, for the first time, the in-situ PXRD confirmed that Ce1-xInxO 2-δ decomposes above 800 ° C and supported the previously claimed metastability. The maximum In-doping level for CeO2 has been determined using PXRD. The lattice constant of the fluorite-type structure Ce1-xInxO2-δ follows the Shannon ionic radii trend, and crystalline domain sizes were found to be dependent on indium concentration.",

author = "Bhella, {Surinderjit Singh} and Shafi, {Shahid P.} and Francesca Trobec and Mario Bieringer and Venkataraman Thangadurai",

year = "2010",

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doi = "10.1021/ic902104r",

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AU - Bhella, Surinderjit Singh

AU - Shafi, Shahid P.

AU - Trobec, Francesca

AU - Bieringer, Mario

AU - Thangadurai, Venkataraman

PY - 2010/2/15

Y1 - 2010/2/15

N2 - We report the first in-situ powder X-ray diffraction (PXRD) study of the BaCO3-CeO2-In2O3 and CeO 2-In2O3 systems in air over a wide range of temperature between 25 and 1200 ° C. Herein, we are investigating the formation pathway and chemical stability of perovskite-type BaCe 1-xInxO3-δ (x = 0.1, 0.2, and 0.3) and corresponding fluorite-type Ce1-xInxO2-δ phases. The potential direct solid state reaction between CeO2 and In2O3 for the formation of indium-doped fluorite-type phase is not observed even up to 1200 ° C in air. The formation of the BaCe1-xInxO3-δ perovskite structures was investigated and rationalized using in-situ PXRD. Furthermore the decomposition of the indium-doped perovskites in CO2 is followed using high temperature diffraction and provides insights into the reaction pathway as well as the thermal stability of the Ce1-xInxO3-δ system. In CO2 flow, BaCe1-xInxO3-δ decomposes above T = 600 ° C into BaCO3 and Ce 1-xInxO2-δ. Furthermore, for the first time, the in-situ PXRD confirmed that Ce1-xInxO 2-δ decomposes above 800 ° C and supported the previously claimed metastability. The maximum In-doping level for CeO2 has been determined using PXRD. The lattice constant of the fluorite-type structure Ce1-xInxO2-δ follows the Shannon ionic radii trend, and crystalline domain sizes were found to be dependent on indium concentration.

AB - We report the first in-situ powder X-ray diffraction (PXRD) study of the BaCO3-CeO2-In2O3 and CeO 2-In2O3 systems in air over a wide range of temperature between 25 and 1200 ° C. Herein, we are investigating the formation pathway and chemical stability of perovskite-type BaCe 1-xInxO3-δ (x = 0.1, 0.2, and 0.3) and corresponding fluorite-type Ce1-xInxO2-δ phases. The potential direct solid state reaction between CeO2 and In2O3 for the formation of indium-doped fluorite-type phase is not observed even up to 1200 ° C in air. The formation of the BaCe1-xInxO3-δ perovskite structures was investigated and rationalized using in-situ PXRD. Furthermore the decomposition of the indium-doped perovskites in CO2 is followed using high temperature diffraction and provides insights into the reaction pathway as well as the thermal stability of the Ce1-xInxO3-δ system. In CO2 flow, BaCe1-xInxO3-δ decomposes above T = 600 ° C into BaCO3 and Ce 1-xInxO2-δ. Furthermore, for the first time, the in-situ PXRD confirmed that Ce1-xInxO 2-δ decomposes above 800 ° C and supported the previously claimed metastability. The maximum In-doping level for CeO2 has been determined using PXRD. The lattice constant of the fluorite-type structure Ce1-xInxO2-δ follows the Shannon ionic radii trend, and crystalline domain sizes were found to be dependent on indium concentration.

U2 - 10.1021/ic902104r

DO - 10.1021/ic902104r

M3 - Article

AN - SCOPUS:77249132326

SN - 0020-1669

VL - 49

SP - 1699

EP - 1704

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 4

ER -

In-situ powder X-ray diffraction investigation of reaction pathways for the BaCO3-CeO2-In2O3 and CeO 2-In2O3 systems

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In-situ powder X-ray diffraction investigation of reaction pathways for the BaCO₃-CeO₂-In₂O₃ and CeO ₂-In₂O₃ systems