Affordable Access

Access to the full text

Thermal investigations of SmFeTeO6 and SmCrTeO6 compounds

Authors
  • Roy, S. P.1
  • Naik, Y.1
  • Rama Rao, G. A.1
  • 1 Bhabha Atomic Research Centre, Product Development Division, RC & I Group, Mumbai, 400085, India , Mumbai (India)
Type
Published Article
Journal
Journal of Thermal Analysis and Calorimetry
Publisher
Springer Netherlands
Publication Date
Apr 23, 2013
Volume
114
Issue
3
Pages
1121–1124
Identifiers
DOI: 10.1007/s10973-013-3094-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

SmFeTeO6 and SmCrTeO6 were synthesized by heating the respective oxides in molar quantities and characterized by X-ray technique. Thermogravimetric studies suggested that SmFeTeO6 and SmCrTeO6 vapourize incongruently according to the reactions:SmFeTeO6(s)→SmFeO3(s)+TeO2(g)+(1/2)O2(g)SmCrTeO6(s)→SmCrO3(s)+TeO2(g)+(1/2)O2(g).\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \begin{aligned} {\text{SmFeTeO}}_{ 6}{({\text{s}})} & \to {\text{SmFeO}}_{ 3} {( {\text{s}})} + {\text{TeO}}_{ 2} {( {\text{g}})} + \left( { 1/ 2} \right){\text{O}}_{ 2}{( {\text{g}})} \\ {\text{SmCrTeO}}_{ 6} {( {\text{s}})} & \to {\text{SmCrO}}_{ 3} {( {\text{s}})} + {\text{TeO}}_{ 2}{( {\text{g}})} + \left( { 1/ 2} \right){\text{O}}_{ 2}{( {\text{g}})}. \\ \end{aligned} $$\end{document}X-ray diffraction data of both the compounds have been indexed on the hexagonal system. Partial pressures of TeO2(g) were measured over SmFeO3(s) and SmCrO3(s) by employing the Knudsen effusion mass loss technique. The standard Gibbs free energy of formation of (ΔfG°) SmFeTeO6(s) and SmCrTeO6(s) were obtained from partial pressures and represented by the following relations:ΔfG∘(SmFeTeO6(s,T))±25kJmol−1=−151.65+0.15(T)(1,090−1,180K)ΔfG∘(SmCrTeO6(s,T))±25kJmole−1=−252.86+0.12(T)(1,100−1,175K).\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Updelta_{\text{f}} G^{\circ} \left( {{\text{SmFeTeO}}_{6}{( {{\text{s}},\,T})}} \right) \pm 2 5\,{\text{kJ}}\,{\text{mol}}^{ - 1} = - 1 5 1. 6 5+ 0. 1 5\left(T \right)\quad \left( 1 ,0 90{-} 1,1 80\,{\text{K}} \right) \\ \Updelta_{\text{f}} G^{\circ } \left( {{\text{SmCrTeO}}_{ 6} {( {{\text{s}},\,T})}} \right) \pm 2 5\,{\text{kJ}}\,{\text{mole}}^{ - 1} = - 2 5 2. 8 6+ 0. 1 2(T)\quad \left( { 1,100 {-} 1 , 1 7 5\,{\text{K}}} \right).$$\end{document}

Report this publication

Statistics

Seen <100 times