Conversion of a Defect Pyrochlore into a Double Perovskite via High-Pressure, High-Temperature Reduction of Te6.
Conversion of a Defect Pyrochlore into a Double Perovskite via High-Pressure, High-Temperature Reduction of Te6.
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通过高压高温还原 Te6 将缺陷烧绿石转化为双钙钛矿。
DOI:
10.1021/acs.inorgchem.9b02472
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发表时间:
2020
影响因子:
4.6
通讯作者:
Denis Romero F
中科院分区:
文献类型:
--
作者:
Denis Romero F
High-pressure, high-temperature reaction conditions can be useful to stabilize metastable polymorphs of complex transition metal oxides. We successfully prepare a new defect pyrochlore Pb 2 FeTeO 6.5 with B-site disordered Fe and Te cations under ambient conditions. Treatment of this material under 8 GPa and 950 C results in a reductive transformation into the B-site cation-ordered double perovskite Pb 2 FeTeO 6. Mössbauer and EELS spectroscopy confirm the iron cations are in the+ 3 oxidation state in both phases indicating that this transformation proceeds via reduction of the tellurium cations under apparently oxidizing conditions. This reaction demonstrates that for a suitably chosen system, it is possible to carry out chemical reactions under pressure in unexpected ways.
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