Structure-property and thermodynamic relationships in rare earth (Y, Eu, Pr) iridate pyrochlores

Tina M. Nenoff; David X. Rademacher; Mark A. Rodriguez; Terry J. Garino; Tamilarasan Subramani; Alexandra Navrotsky

doi:10.1016/j.jssc.2021.122163

Structure-property and thermodynamic relationships in rare earth (Y, Eu, Pr) iridate pyrochlores

Tina M. Nenoff, David X. Rademacher, Mark A. Rodriguez, Terry J. Garino, Tamilarasan Subramani, Alexandra Navrotsky

Molecular Sciences, School of (SMS)

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

5 Scopus citations

Abstract

This study relates structure, properties and thermodynamics, through synthesis, characterization and heat of formation measurements of rare earth iridate pyrochlore (RE₂Ir₂O₇; RE = Y, Eu, Pr) crystalline powders. The RE₂Ir₂O₇ phases are synthesized by high temperature solid-state synthesis methods. X-ray diffraction and elemental analysis techniques are utilized to validate the synthesis and enable structural comparisons. Trends in the bond angles indicate deviations from the Y and Eu analogs for the Pr₂Ir₂O₇ phase. High temperature oxide melt solution calorimetry is used to determine the heats of formation of each phase. Breaking the trend expected across the rare earth series, the enthalpy of formation for Pr₂Ir₂O₇ is more exothermic than the anticipated from the Y and Eu analogs.

Original language	English (US)
Article number	122163
Journal	Journal of Solid State Chemistry
Volume	299
DOIs	https://doi.org/10.1016/j.jssc.2021.122163
State	Published - Jul 2021

Keywords

Calorimetry
Heats of formation
Iridate
Lattice parameter
Pyrochlore
Rare earth

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jssc.2021.122163

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title = "Structure-property and thermodynamic relationships in rare earth (Y, Eu, Pr) iridate pyrochlores",

abstract = "This study relates structure, properties and thermodynamics, through synthesis, characterization and heat of formation measurements of rare earth iridate pyrochlore (RE2Ir2O7; RE = Y, Eu, Pr) crystalline powders. The RE2Ir2O7 phases are synthesized by high temperature solid-state synthesis methods. X-ray diffraction and elemental analysis techniques are utilized to validate the synthesis and enable structural comparisons. Trends in the bond angles indicate deviations from the Y and Eu analogs for the Pr2Ir2O7 phase. High temperature oxide melt solution calorimetry is used to determine the heats of formation of each phase. Breaking the trend expected across the rare earth series, the enthalpy of formation for Pr2Ir2O7 is more exothermic than the anticipated from the Y and Eu analogs.",

keywords = "Calorimetry, Heats of formation, Iridate, Lattice parameter, Pyrochlore, Rare earth",

author = "Nenoff, {Tina M.} and Rademacher, {David X.} and Rodriguez, {Mark A.} and Garino, {Terry J.} and Tamilarasan Subramani and Alexandra Navrotsky",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Inc.",

year = "2021",

month = jul,

doi = "10.1016/j.jssc.2021.122163",

language = "English (US)",

volume = "299",

journal = "Journal of Solid State Chemistry",

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publisher = "Academic Press Inc.",

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T1 - Structure-property and thermodynamic relationships in rare earth (Y, Eu, Pr) iridate pyrochlores

AU - Nenoff, Tina M.

AU - Rademacher, David X.

AU - Rodriguez, Mark A.

AU - Garino, Terry J.

AU - Subramani, Tamilarasan

AU - Navrotsky, Alexandra

PY - 2021/7

Y1 - 2021/7

N2 - This study relates structure, properties and thermodynamics, through synthesis, characterization and heat of formation measurements of rare earth iridate pyrochlore (RE2Ir2O7; RE = Y, Eu, Pr) crystalline powders. The RE2Ir2O7 phases are synthesized by high temperature solid-state synthesis methods. X-ray diffraction and elemental analysis techniques are utilized to validate the synthesis and enable structural comparisons. Trends in the bond angles indicate deviations from the Y and Eu analogs for the Pr2Ir2O7 phase. High temperature oxide melt solution calorimetry is used to determine the heats of formation of each phase. Breaking the trend expected across the rare earth series, the enthalpy of formation for Pr2Ir2O7 is more exothermic than the anticipated from the Y and Eu analogs.

AB - This study relates structure, properties and thermodynamics, through synthesis, characterization and heat of formation measurements of rare earth iridate pyrochlore (RE2Ir2O7; RE = Y, Eu, Pr) crystalline powders. The RE2Ir2O7 phases are synthesized by high temperature solid-state synthesis methods. X-ray diffraction and elemental analysis techniques are utilized to validate the synthesis and enable structural comparisons. Trends in the bond angles indicate deviations from the Y and Eu analogs for the Pr2Ir2O7 phase. High temperature oxide melt solution calorimetry is used to determine the heats of formation of each phase. Breaking the trend expected across the rare earth series, the enthalpy of formation for Pr2Ir2O7 is more exothermic than the anticipated from the Y and Eu analogs.

KW - Calorimetry

KW - Heats of formation

KW - Iridate

KW - Lattice parameter

KW - Pyrochlore

KW - Rare earth

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DO - 10.1016/j.jssc.2021.122163

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VL - 299

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

M1 - 122163

ER -

Structure-property and thermodynamic relationships in rare earth (Y, Eu, Pr) iridate pyrochlores

Abstract

Keywords

ASJC Scopus subject areas

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