Formation enthalpies and heat capacities of rear earth titanates: RE2TiO5 (RE=La, Nd and Gd)

被引：32
|
作者：
Hayun, Shmuel
Navrotsky, Alexandra [1 ]
机构：
[1] Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2012年 / 187卷
基金：
美国国家科学基金会;
关键词：
Rear earth titanates; Formation enthalpy; Heat capacity; PYROCHLORE; IMMOBILIZATION; DIRECTIONS; DISORDER; PROGRESS; WASTE; ORDER;
D O I：
10.1016/j.jssc.2011.12.033
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The formation enthalpies and heat capacities of orthorhombic rare earth titanates, RE2TiO5 (RE = La, Nd and Gd), have been studied by high temperature differential scanning calorimetry (300-1473 K) and oxide-melt solution calorimetry. The RE2TiO5 samples are stable in enthalpy with respect to their oxides and the pyrochlore RE2Ti2O7 phase. The general trend that has been demonstrated in other RE-ternary systems; decreasing thermodynamic stability with decreasing R-A/R-B was found to be valid for the RE2TiO5, and their enthalpies of formation from oxides become more negative with increasing RE3+ ionic radius. (C) 2012 Elsevier Inc. All rights reserved.
引用
收藏
页码：70 / 74
页数：5
相关论文
共 50 条
  • [1] Calorimetric measurements on rare earth titanates: RE2TiO5 (RE = Sm, Gd and Dy)
    R. Kandan
    B. Prabhakara Reddy
    G. Panneerselvam
    K. Nagarajan
    Journal of Thermal Analysis and Calorimetry, 2016, 124 : 1349 - 1355
  • [2] Calorimetric measurements on rare earth titanates: RE2TiO5 (RE = Sm, Gd and Dy)
    Kandan, R.
    Reddy, B. Prabhakara
    Panneerselvam, G.
    Nagarajan, K.
    JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2016, 124 (03) : 1349 - 1355
  • [3] Re2TiO5: Special dielectric titanates exhibiting abnormally low permittivity and a positive coefficient of resonance frequency
    Zhu, Guobin
    Chen, Deqin
    Zhu, Xiaowei
    Xiong, Siyu
    Xiao, Hongxiang
    Liu, Laijun
    Li, Chunchun
    JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2024, 107 (04) : 2029 - 2039
  • [4] Towards thermal barrier coating application for rare earth silicates RE2SiO5 (RE = La, Nd, Sm, Eu, and Gd)
    Tian, Zhilin
    Zhang, Jie
    Zhang, Tianyin
    Ren, Xiaomin
    Hu, Wanpeng
    Zheng, Liya
    Wang, Jingyang
    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2019, 39 (04) : 1463 - 1476
  • [5] Rare Earth-Rich Indides RE5Pt2In4 (RE = Sc, Y, La–Nd, Sm, Gd–Tm, Lu)
    Roman Zaremba
    Ute Ch. Rodewald
    Rainer Pöttgen
    Monatshefte für Chemie - Chemical Monthly, 2007, 138 : 819 - 822
  • [6] Rare earth-rhodium-plumbides RE2Rh2Pb with RE= La-Nd, Sm, Gd and Tb
    Heletta, Lukas
    Poettgen, Rainer
    ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 2018, 73 (12): : 1015 - 1021
  • [7] The standard molar enthalpies of formation of RE6UO12 (RE = La, Nd) by acid solution calorimetry
    R. Venkata Krishnan
    G. Jogeswararao
    K. Ananthasivan
    Journal of Thermal Analysis and Calorimetry, 2015, 121 : 1375 - 1382
  • [8] The standard molar enthalpies of formation of RE6UO12 (RE = La, Nd) by acid solution calorimetry
    Krishnan, R. Venkata
    Jogeswararao, G.
    Ananthasivan, K.
    JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2015, 121 (03) : 1375 - 1382
  • [9] Standard enthalpies of formation of RE(Et2dtc)3(phen) (RE = Sm, Eu, and Gd)
    Chen, S
    Gao, S
    Wei, Q
    Xie, G
    Shi, Q
    RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY, 2005, 79 (07): : 1022 - 1028
  • [10] Rare earth-rich indides RE5Pt2In4 (RE = sc, y, la-nd, sm, gd-tm, lu)
    Zaremba, Roman
    Rodewald, Ute Ch.
    Poettgen, Rainer
    MONATSHEFTE FUR CHEMIE, 2007, 138 (09): : 819 - 822
12345