Synthesis, high-temperature heat capacity and thermal conductivity of multi-component rare-earth zirconates

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Resumo

The synthesis of multicomponent single-phase rare earth zirconates LaGdZr2O7, (LaSmGd)2/3Zr2O7, (LaSmGdY)1/2Zr2O7, (LaNdSmGdY)2/5Zr2O7 of the pyrochlore structure was performed. The isobaric heat capacity at 300–1800 K, thermal diffusivity were measured and the thermal conductivity of non-porous samples in the range of 300–1300 K was calculated.

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Sobre autores

P. Gagarin

Kurnakov Institute General and Inorganic Chemistry Russian Academy of Sciences

Autor responsável pela correspondência
Email: gagarin@igic.ras.ru
Rússia, Lenisky pr., 31, Moscow, 119991

A. Guskov

Kurnakov Institute General and Inorganic Chemistry Russian Academy of Sciences

Email: gagarin@igic.ras.ru
Rússia, Lenisky pr., 31, Moscow, 119991

V. Guskov

Kurnakov Institute General and Inorganic Chemistry Russian Academy of Sciences

Email: gagarin@igic.ras.ru
Rússia, Lenisky pr., 31, Moscow, 119991

K. Gavrichev

Kurnakov Institute General and Inorganic Chemistry Russian Academy of Sciences

Email: gagarin@igic.ras.ru
Rússia, Lenisky pr., 31, Moscow, 119991

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2. Fig. 1. Results of DSC/TG analysis of precursors for obtaining LaGdZr2O7 (a), (LaSmGd)2/3Zr2O7 (b), (LaSmGdY)1/2Zr2O7 (c) and (LaNdSmGdY)2/5Zr2O7 (d); DSC of the LaGdZr2O7 precursor (d).

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3. Fig. 2. Diffraction patterns of LaGdZr2O7 (1), (LaSmGd)2/3Zr2O7 (2), (LaSmGdY)1/2Zr2O7 (3) and (LaNdSmGdY)2/5Zr2O7 (4) samples annealed at 800 (a), 1000 (b) and 1600°C (c).

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4. Fig. 3. Surface morphology of LaGdZr2O7 (1), (LaSmGd)2/3Zr2O7 (2), (LaSmGdY)1/2Zr2O7 (3) and (LaNdSmGdY)2/5Zr2O7 (4) samples annealed at 800 (a) and 1600°C (b); magnification ×60000.

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5. Fig. 4. Molar heat capacity of LaGdZr2O7: 1 – experiment; 2, 3 – Neumann–Kopp calculations: 2 – from heat capacities of double zirconates (Table 2), 3 – from heat capacities of simple oxides [39, 40].

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6. Fig. 5. Thermal diffusivity (a) and thermal conductivity (b) of samples of LaGdZr2O7 (1), (LaSmGd)2/3Zr2O7 (2), (LaSmGdY)1/2Zr2O7 (3) and (LaNdSmGdY)2/5Zr2O7 (4).

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