CaFeFeNbO6 - an iron-based double double perovskite.
CaFeFeNbO6 - an iron-based double double perovskite.
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CaFeFeNbO6 - 一种铁基双双钙钛矿。
DOI：
10.1039/d3cc01115a
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Ji K
中科院分区：
文献类型：
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作者：
Ji K
阳离子的有序化对于控制ABO 3钙钛矿的性质是重要的，并且CaFeFeNbO 6是Fe基AA'BB' O 6双双钙钛矿的第一个例子，其中Ca 2 +/Fe 2+在A位柱上有序化，并且Fe 3 +/Nb 5+在八面体B位。后者阳离子的大量（37%）反位无序导致自旋玻璃磁性低于在12 K的冻结转变。CaMnFeNbO 6类似物也显示出大量的阳离子无序和自旋玻璃态行为。基于不同A位过渡金属的有序材料的合成压力的比较表明，将需要至少14-18 GPa的压力来发现基于小于Mn 2+的A'阳离子的预期过多的双双钙钛矿。
Ordering of cations is important for controlling properties of ABO3 perovskites, and CaFeFeNbO6 is the first example of an Fe-based AA’BB’O6 double double perovskite, with Ca2+/Fe2+ ordered on A-site columns, and Fe3+/Nb5+ at the octahedral B-sites. Substantial (37%) antisite disorder of the latter cations leads to spin glassy magnetism below a freezing transition at 12 K. The CaMnFeNbO6 analogue also shows substantial cation disorder and spin glassy behaviour. Comparison of synthesis pressures for ordered materials based on different A-site transition metals, suggests that pressures of at least 14–18 GPa will be required to discover the expected plethora of double double perovskites based on A’ cations smaller than Mn2+.