Details

Autor(en) / Beteiligte

• Patil, Bhimarao M.
• Wadhawa, Gurumeet C.
• Chaskar, Atul C.
• Walke, Pravin S.

Titel

Low-temperature synthesis and thermal expansion of nanocrystalline monoclinic zirconolite ceramics

Ist Teil von

• Journal of thermal analysis and calorimetry, 2023-08, Vol.148 (15), p.7591-7596

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The nanocrystalline Zirconolite (CaZrTi 2 O 7 or CZT) powder was successfully synthesized at low temperature using wet chemical method. The calcination temperature was estimated by simultaneous thermogravimetry and differential thermal analysis (TG–DTA). The calcination of the precursor at the various temperatures (600–1250 °C) exhibited two major phases of nanocrystalline CZT powder. The XRD pattern has confirmed the formation of the fluorite structure at 600–900 °C. However, the fluorite structure of the CZT was completely transformed to monoclinic (2 M) structure at 1000 °C. Further, SEM, and TEM have investigated the influence of annealing temperatures on the microstructures and particle size. The linear thermal expansion of sintered CZT pellet was measured by dilatometrically in the range of 30–950 °C and the calculated thermal expansion coefficient value was (α) = 9.93 × 10 –6  K −1 . The theoretical density > 95% was achieved in nanocrystalline CZT powder after being pelletized and sintered at 1250 °C for 5 h. The thermal expansion coefficient and density of the CZT are favorable for potential application in the immobilization of radwaste containing actinide and lanthanides.