Features of synthetic approaches to the production of stannates with a pyrochlore structure and the study of their thermodynamic properties

The paper discusses synthetic approaches to the preparation of compounds with a pyrochlore structure using the example of compounds of composition Ln2Sn2O7 (Ln = La–Lu). Optimal temperature-time schemes for synthesis of single-phase samples were established and crystallographic parameters of compounds were determined.Morphology of samples obtained at different conditions was determined. Heat capacity measured and calculated thermodynamic functions in a wide temperature range (2.5–1300 K).