Synthesis, vaporization, and thermodynamics of ultrafine Nd2Hf2O7 powders

Autor:	N. P. Simonenko, D. V. Sevast’yanov, N. T. Kuznetsov, Elizaveta P. Simonenko, Vladimir G. Sevastyanov, Sergey I. Lopatin, Valentina L. Stolyarova
Rok vydání:	2013
Předmět:	Materials science Scanning electron microscope Materials Science (miscellaneous) Analytical chemistry Pyrochlore engineering.material Mass spectrometry Microstructure Inorganic Chemistry Phase composition Thermal Vaporization engineering Knudsen number Physical and Theoretical Chemistry
Zdroj:	Russian Journal of Inorganic Chemistry. 58:1-8
ISSN:	1531-8613 0036-0236
DOI:	10.1134/s0036023613010178
Popis:	Ultrafine Nd2Hf2O7 powders with the pyrochlore structure are prepared by self-propagating hightemperature synthesis (in the Pechini version). The elemental and phase composition of the powder are studied. Microstructure is studied by scanning electron microscopy. BET specific surface areas are determined. Thermal behavior is studied by TGA/DSC/DTA up to 1473 K. The sintering kinetics of as-synthesized Nd2Hf2O7 powder at various temperatures is studied. Nd2Hf2O7 vaporization in the range 2400–2600 K is studied by Knudsen effusion/mass spectrometry, and the thermodynamic characteristics of this compound are determined.
Databáze:	OpenAIRE
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