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- W2517990925 abstract "The mineral loparite is the principal ore of the light rare earth elements (LREE) with solid solution compositions in the quaternary system perovskite-lueshite-tausonite-loparite (CaTiO3-NaNbO3-SrTiO3-Na0.5 Ln 0.5TiO3) ( Ln = La, Ce, Pr, Nd). In this study, perovskite solid solutions Ca1−2xNaxLaxTiO3 (0 ≤ x ≤ 0.50) along the perovskite-loparite join were synthesized using solid-state sintering methods. XRD analysis indicates that as the Na+La content increases, the structure changes from orthorhombic to tetragonal. The enthalpies of formation at 298 K from the constituent oxides ![Formula][1] and from the elements ![Formula][2] have been determined using high-temperature oxide melt solution calorimetry in molten 3Na2O·4MoO3 at 973 K. Enthalpy of formation from oxides ![Formula][3] becomes more exothermic with increasing Na+La content, suggesting a stabilization effect of the substitution Ca2+ → 0.5Na+ + 0.5La3+. The observed trend of increasing thermodynamic stability with decreasing structural distortion is in agreement with that seen in many other ABO3 perovskites. The thermodynamic stability of perovskite solid solutions Ca1−2xNaxLaxTiO3 (0 ≤ x ≤ 0.50) along the CaTiO3-Na0.5La0.5TiO3 join provides insights into the natural occurrence of loparite minerals (La,Na,Sr,Ca)(Ti,Nb,Ta,Fe3+)O3. [1]: /embed/mml-math-1.gif [2]: /embed/mml-math-2.gif [3]: /embed/mml-math-3.gif" @default.
- W2517990925 created "2016-09-16" @default.
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- W2517990925 date "2016-09-01" @default.
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- W2517990925 title "Rare-earth perovskites along the CaTiO3-Na0.5La0.5TiO3join: Phase transitions, formation enthalpies, and implications for loparite minerals" @default.
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- W2517990925 doi "https://doi.org/10.2138/am-2016-5740" @default.
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!["The mineral loparite is the principal ore of the light rare earth elements (LREE) with solid solution compositions in the quaternary system perovskite-lueshite-tausonite-loparite (CaTiO3-NaNbO3-SrTiO3-Na0.5 Ln 0.5TiO3) ( Ln = La, Ce, Pr, Nd). In this study, perovskite solid solutions Ca1−2xNaxLaxTiO3 (0 ≤ x ≤ 0.50) along the perovskite-loparite join were synthesized using solid-state sintering methods. XRD analysis indicates that as the Na+La content increases, the structure changes from orthorhombic to tetragonal. The enthalpies of formation at 298 K from the constituent oxides ![Formula][1] and from the elements ![Formula][2] have been determined using high-temperature oxide melt solution calorimetry in molten 3Na2O·4MoO3 at 973 K. Enthalpy of formation from oxides ![Formula][3] becomes more exothermic with increasing Na+La content, suggesting a stabilization effect of the substitution Ca2+ → 0.5Na+ + 0.5La3+. The observed trend of increasing thermodynamic stability with decreasing structural distortion is in agreement with that seen in many other ABO3 perovskites. The thermodynamic stability of perovskite solid solutions Ca1−2xNaxLaxTiO3 (0 ≤ x ≤ 0.50) along the CaTiO3-Na0.5La0.5TiO3 join provides insights into the natural occurrence of loparite minerals (La,Na,Sr,Ca)(Ti,Nb,Ta,Fe3+)O3. [1]: /embed/mml-math-1.gif [2]: /embed/mml-math-2.gif [3]: /embed/mml-math-3.gif"](?object=%22The%20mineral%20loparite%20is%20the%20principal%20ore%20of%20the%20light%20rare%20earth%20elements%20(LREE)%20with%20solid%20solution%20compositions%20in%20the%20quaternary%20system%20perovskite-lueshite-tausonite-loparite%20(CaTiO3-NaNbO3-SrTiO3-Na0.5%20Ln%200.5TiO3)%20(%20Ln%20%3D%20La%2C%20Ce%2C%20Pr%2C%20Nd).%20In%20this%20study%2C%20perovskite%20solid%20solutions%20Ca1%E2%88%922xNaxLaxTiO3%20(0%20%E2%89%A4%20x%20%E2%89%A4%200.50)%20along%20the%20perovskite-loparite%20join%20were%20synthesized%20using%20solid-state%20sintering%20methods.%20XRD%20analysis%20indicates%20that%20as%20the%20Na%2BLa%20content%20increases%2C%20the%20structure%20changes%20from%20orthorhombic%20to%20tetragonal.%20The%20enthalpies%20of%20formation%20at%20298%20K%20from%20the%20constituent%20oxides%20!%5BFormula%5D%5B1%5D%20and%20from%20the%20elements%20!%5BFormula%5D%5B2%5D%20have%20been%20determined%20using%20high-temperature%20oxide%20melt%20solution%20calorimetry%20in%20molten%203Na2O%C2%B74MoO3%20at%20973%20K.%20Enthalpy%20of%20formation%20from%20oxides%20!%5BFormula%5D%5B3%5D%20becomes%20more%20exothermic%20with%20increasing%20Na%2BLa%20content%2C%20suggesting%20a%20stabilization%20effect%20of%20the%20substitution%20Ca2%2B%20%E2%86%92%200.5Na%2B%20%2B%200.5La3%2B.%20The%20observed%20trend%20of%20increasing%20thermodynamic%20stability%20with%20decreasing%20structural%20distortion%20is%20in%20agreement%20with%20that%20seen%20in%20many%20other%20ABO3%20perovskites.%20The%20thermodynamic%20stability%20of%20perovskite%20solid%20solutions%20Ca1%E2%88%922xNaxLaxTiO3%20(0%20%E2%89%A4%20x%20%E2%89%A4%200.50)%20along%20the%20CaTiO3-Na0.5La0.5TiO3%20join%20provides%20insights%20into%20the%20natural%20occurrence%20of%20loparite%20minerals%20(La%2CNa%2CSr%2CCa)(Ti%2CNb%2CTa%2CFe3%2B)O3.%20%5B1%5D%3A%20%2Fembed%2Fmml-math-1.gif%20%5B2%5D%3A%20%2Fembed%2Fmml-math-2.gif%20%5B3%5D%3A%20%2Fembed%2Fmml-math-3.gif%22){kind=link}