Sabarthes Etienne, Delorme Fabian, Tezyk Vladyslav, Autret Cécile, Corbel Gwenaël, Lacorre Philippe, Giovannelli Fabien
Université de Tours, CNRS, INSA, GREMAN UMR 7347, IUT de Blois, 15 rue de la chocolaterie, CS 2903, 41029 Blois Cedex, France.
Dalton Trans. 2019 Jul 9;48(27):10051-10061. doi: 10.1039/c9dt01192g.
(La1-xPrx)2Mo2O9 powders were synthesized by solid state reaction for x = 0.00, 0.10, 0.25, 0.50, 0.75 and 1.00. Dense pellets were obtained by conventional sintering in air. Their thermal stability and thermal conductivity were measured from 100 to 700 °C and their cell parameters refined from X-ray powder diffraction pattern by the Rietveld method. A 50 mol% isovalent substitution of lanthanum in La2Mo2O9 by praseodymium stabilizes the high temperature β phase while reducing the thermal conductivity of the parent compound by 11-18%. For a praseodymium content x higher than 0.75, the thermal conductivity increases and a phase transition similar to that of La2Mo2O9 is observed except that the room temperature phase appears to be this time triclinic in symmetry.
通过固态反应合成了x = 0.00、0.10、0.25、0.50、0.75和1.00的(La1-xPrx)2Mo2O9粉末。通过在空气中进行常规烧结获得致密小球。在100至700°C范围内测量了它们的热稳定性和热导率，并通过Rietveld方法从X射线粉末衍射图谱中精修了它们的晶胞参数。用镨对La2Mo2O9中50 mol%的镧进行等价取代，可稳定高温β相，同时使母体化合物的热导率降低11 - 18%。当镨含量x高于0.75时，热导率增加，并且观察到与La2Mo2O9类似的相变，只是此时室温相的对称性似乎为三斜晶系。
