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- W3035137736 abstract "Zirconate systems having the composition 3HfO 2 ·15SiO 2 · x Y 2 O 3 ·(82 − x )ZrO 2 , where x = 2, 7 and 12 mol% Y 2 O 3 , were synthesized by a sol-gel method. The analysis of X-ray diffraction data showed the presence of the t-ZrO 2 , m-ZrO 2 , m-HfO 2 , Y 2 SiO 5 and Y 2 Si 2 O 7 crystalline phases in a ceramic nanomixture. Spectroscopic data show that the increase of the Y 2 O 3 content of samples determines the increase of the t-ZrO 2 , m-HfO 2 and silicate crystalline phases. Gap energy values decrease almost linearly with increasing Y 2 O 3 content of samples. A detailed study of XANES data does not show a significant difference with increasing Y 2 O 3 content of the samples suggesting an appreciable stability of the hafnium ions +4 oxidation state and their microvicinity. EXAFS results show that the local structure around the Hf cation is similar to that from the monoclinic crystalline HfO 2 where the Hf–O coordination number tends to 7. The bond lengths of Hf–O shells show small deviations from ∼2.12 Å and the Hf–metal paths become more structured by increasing the Y 2 O 3 content of the samples." @default.
- W3035137736 created "2020-06-19" @default.
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- W3035137736 date "2020-06-08" @default.
- W3035137736 modified "2023-10-16" @default.
- W3035137736 title "Characteristics and local structure of hafnia-silicate-zirconate ceramic nanomixtures" @default.
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- W3035137736 doi "https://doi.org/10.1107/s1600577520006207" @default.
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