Nanocrystalline Powders of Dysprosium Hafnate and Ceramics on Their Basis
Chemical deposition from salt solutions (co-deposition) has been chosen and investigated as a method for synthesizing dysprosium hafnate complex oxide Dy 2 HfO 5 . Regimes for synthesis of low-aggregated single-phase Dy 2 HfO 5 nanocrystalline powders using a microwave furnace have been developed. I...
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Veröffentlicht in: | Crystallography reports 2019-03, Vol.64 (2), p.342-347 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Chemical deposition from salt solutions (co-deposition) has been chosen and investigated as a method for synthesizing dysprosium hafnate complex oxide Dy
2
HfO
5
. Regimes for synthesis of low-aggregated single-phase Dy
2
HfO
5
nanocrystalline powders using a microwave furnace have been developed. It is shown that the synthesized Dy
2
HfO
5
powders subjected to high-energy grinding and mechanical activation consist of crystallites with a size of no larger than 10 nm and a specific surface of no smaller than10 m
2
/g. High-density ceramics has been prepared by uniaxial compacting of mechanically activated nanocrystalline powders with subsequent isothermal annealing of the compacts. Test batches of the Dy
2
HfO
5
pellets with a density ranging from 8.25 to 9.10 g/cm
3
, a thermal conductivity varying from 1.21 to 1.63 W/(m K), a thermal expansion coefficient in the range from 7.1 to 8.7 × 10
–6
K
–1
, and Young’s modulus in the range from 168 to 221 GPa have been fabricated and certified. |
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ISSN: | 1063-7745 1562-689X |
DOI: | 10.1134/S1063774519020214 |