Formation enthalpies of LaLnO3 (Ln=Ho, Er, Tm and Yb) interlanthanide perovskites

Jianqi Qi; Xiaofeng Guo; Aleksandra Mielewczyk-Gryn; Alexandra Navrotsky

doi:10.1016/j.jssc.2015.03.026

Formation enthalpies of LaLnO₃ (Ln=Ho, Er, Tm and Yb) interlanthanide perovskites

Jianqi Qi, Xiaofeng Guo, Aleksandra Mielewczyk-Gryn, Alexandra Navrotsky

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

24 Scopus citations

Abstract

High-temperature oxide melt solution calorimetry using 3Na₂O·MoO₃ at 802 °C was performed for interlanthanide perovskites LaLnO₃ (Ln=Ho, Er, Tm and Yb) and lanthanide oxides (La₂O₃, Ho₂O₃, Er₂O₃, Tm₂O₃ and Yb₂O₃). The enthalpies of formation of these interlanthanide perovskites from binary lanthanide oxides at room temperature (25 °C) were determined to be -8.3±3.4 kJ/mol for LaHoO₃, -9.9±3.0 kJ/mol for LaErO₃, -10.8±2.7 kJ/mol for LaTmO₃ and -12.3±2.9 kJ/mol for LaYbO₃. There is a roughly linear relationships between these enthalpy values and the tolerance factor for these and for other LaM³⁺O₃ (M=In, Sc, Ga, Al, Fe and Cr) perovskites, confirming that the distortion of the perovskites as results from ionic radius difference of A-site and B-site cations, is the main factor determining the stability of these compounds.

Original language	English (US)
Pages (from-to)	150-154
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	227
DOIs	https://doi.org/10.1016/j.jssc.2015.03.026
State	Published - Jul 1 2015
Externally published	Yes

Keywords

Calorimetry
Enthalpy of formation
Lanthanide
Perovskite

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.2015.03.026

Cite this

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title = "Formation enthalpies of LaLnO3 (Ln=Ho, Er, Tm and Yb) interlanthanide perovskites",

abstract = "High-temperature oxide melt solution calorimetry using 3Na2O·MoO3 at 802 °C was performed for interlanthanide perovskites LaLnO3 (Ln=Ho, Er, Tm and Yb) and lanthanide oxides (La2O3, Ho2O3, Er2O3, Tm2O3 and Yb2O3). The enthalpies of formation of these interlanthanide perovskites from binary lanthanide oxides at room temperature (25 °C) were determined to be -8.3±3.4 kJ/mol for LaHoO3, -9.9±3.0 kJ/mol for LaErO3, -10.8±2.7 kJ/mol for LaTmO3 and -12.3±2.9 kJ/mol for LaYbO3. There is a roughly linear relationships between these enthalpy values and the tolerance factor for these and for other LaM3+O3 (M=In, Sc, Ga, Al, Fe and Cr) perovskites, confirming that the distortion of the perovskites as results from ionic radius difference of A-site and B-site cations, is the main factor determining the stability of these compounds.",

keywords = "Calorimetry, Enthalpy of formation, Lanthanide, Perovskite",

author = "Jianqi Qi and Xiaofeng Guo and Aleksandra Mielewczyk-Gryn and Alexandra Navrotsky",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Inc.",

year = "2015",

month = jul,

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doi = "10.1016/j.jssc.2015.03.026",

language = "English (US)",

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pages = "150--154",

journal = "Journal of Solid State Chemistry",

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T1 - Formation enthalpies of LaLnO3 (Ln=Ho, Er, Tm and Yb) interlanthanide perovskites

AU - Qi, Jianqi

AU - Guo, Xiaofeng

AU - Mielewczyk-Gryn, Aleksandra

AU - Navrotsky, Alexandra

PY - 2015/7/1

Y1 - 2015/7/1

N2 - High-temperature oxide melt solution calorimetry using 3Na2O·MoO3 at 802 °C was performed for interlanthanide perovskites LaLnO3 (Ln=Ho, Er, Tm and Yb) and lanthanide oxides (La2O3, Ho2O3, Er2O3, Tm2O3 and Yb2O3). The enthalpies of formation of these interlanthanide perovskites from binary lanthanide oxides at room temperature (25 °C) were determined to be -8.3±3.4 kJ/mol for LaHoO3, -9.9±3.0 kJ/mol for LaErO3, -10.8±2.7 kJ/mol for LaTmO3 and -12.3±2.9 kJ/mol for LaYbO3. There is a roughly linear relationships between these enthalpy values and the tolerance factor for these and for other LaM3+O3 (M=In, Sc, Ga, Al, Fe and Cr) perovskites, confirming that the distortion of the perovskites as results from ionic radius difference of A-site and B-site cations, is the main factor determining the stability of these compounds.

AB - High-temperature oxide melt solution calorimetry using 3Na2O·MoO3 at 802 °C was performed for interlanthanide perovskites LaLnO3 (Ln=Ho, Er, Tm and Yb) and lanthanide oxides (La2O3, Ho2O3, Er2O3, Tm2O3 and Yb2O3). The enthalpies of formation of these interlanthanide perovskites from binary lanthanide oxides at room temperature (25 °C) were determined to be -8.3±3.4 kJ/mol for LaHoO3, -9.9±3.0 kJ/mol for LaErO3, -10.8±2.7 kJ/mol for LaTmO3 and -12.3±2.9 kJ/mol for LaYbO3. There is a roughly linear relationships between these enthalpy values and the tolerance factor for these and for other LaM3+O3 (M=In, Sc, Ga, Al, Fe and Cr) perovskites, confirming that the distortion of the perovskites as results from ionic radius difference of A-site and B-site cations, is the main factor determining the stability of these compounds.

KW - Calorimetry

KW - Enthalpy of formation

KW - Lanthanide

KW - Perovskite

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