Experimental determination of the enthalpy of formation of the pyrochlore rare‐earth hafnates
I. Bajenova, A. V. Guskov, П. Г. Гагарин, Alexandra Khvan, К. С. Гавричев
Abstract
Abstract In this study, enthalpies of formation of compounds RE 2 Hf 2 O 7 type (where RE = La, Pr, Nd, Sm, Eu, and Gd), with pyrochlore structure have been measured by high‐temperature oxide melt solution calorimetry. Results were compared with literature data, and dependencies of enthalpies of the formation of compounds with the pyrochlore structure from the ionic radius of rare‐earth element were analyzed. The enthalpy of formation becomes more positive with the increase in ionic radius, which is in conformity with the results earlier observed for titanates and zirconates.
Topics & Concepts
PyrochloreIonic radiusStandard enthalpy change of formationStandard enthalpy of formationCalorimetryEnthalpyIonic bondingOxideRADIUSRare-earth elementThermodynamicsPhysical chemistryMaterials scienceInorganic chemistryChemistryRare earthIonMineralogyMetallurgyPhysicsOrganic chemistryPhase (matter)Computer securityComputer scienceNuclear materials and radiation effectsAdvanced Condensed Matter PhysicsRadioactive element chemistry and processing