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Phase transition tuning by Fe(iii)/Co(iii) substitution in switchable cyano-bridged perovskites: (C3H5N2)2[KFexCo1-x(CN)6].
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-04-08 , DOI: 10.1039/d0dt00615g Magdalena Rok 1 , Marcin Moskwa , Andrzej Pawlukojć , Rafał Janicki , Iga Zuba , Piotr Zieliński , Paweł Sobieszczyk , Grażyna Bator
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-04-08 , DOI: 10.1039/d0dt00615g Magdalena Rok 1 , Marcin Moskwa , Andrzej Pawlukojć , Rafał Janicki , Iga Zuba , Piotr Zieliński , Paweł Sobieszczyk , Grażyna Bator
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The single-crystals of mixed (C3H5N2)2[KFexCo1-x(CN)6] crystals, with different ratios of x = 0, 0.29, 0.42, 0.51, 0.63, 0.70, 0.85, 1, have been grown from aqueous solutions. The thermal stability of the crystals has been determined using both DTA and TGA analysis. DSC has revealed sequences of structural phase transitions (PTs). We have found four solid phases for the crystals with concentrations x < 0.6 and three phases above these concentrations. The Fe(iii) concentration has been estimated using the SEM technique. We have found the linear relationship of Tcversus the molar concentration of Fe(iii) for the IV → III PT. Based on the obtained results, a phase diagram has been constructed. The mechanism of the structural PTs has been discussed based on the results of dielectric relaxation, NIR, IR and Raman spectroscopyand X-ray measurements. Dielectric switching has been observed for all analysed mixed-crystals. All crystals exhibit ferroelastic properties.
中文翻译：
在可转换的氰基桥接钙钛矿中通过Fe（iii）/ Co（iii）取代进行相变调谐：（C3H5N2）2 [KFexCo1-x（CN）6]。
从水溶液中生长出具有不同比率x = 0、0.29、0.42、0.51、0.63、0.70、0.85、1的混合（C3H5N2）2 [KFexCo1-x（CN）6]晶体。晶体的热稳定性已通过DTA和TGA分析确定。DSC揭示了结构相变（PT）的序列。我们发现浓度x <0.6的晶体有四个固相，而浓度高于这些浓度的三相。Fe（iii）浓度已使用SEM技术进行了估算。我们已经发现IV→III PT的Tcvers与Fe（iii）摩尔浓度的线性关系。根据获得的结果，已构建了相图。基于介电弛豫，NIR，IR和拉曼光谱以及X射线测量的结果，讨论了结构PT的机理。已经观察到所有分析的混合晶体的介电转换。所有晶体均表现出铁弹性。
更新日期：2020-03-20
中文翻译：
在可转换的氰基桥接钙钛矿中通过Fe（iii）/ Co（iii）取代进行相变调谐：（C3H5N2）2 [KFexCo1-x（CN）6]。
从水溶液中生长出具有不同比率x = 0、0.29、0.42、0.51、0.63、0.70、0.85、1的混合（C3H5N2）2 [KFexCo1-x（CN）6]晶体。晶体的热稳定性已通过DTA和TGA分析确定。DSC揭示了结构相变（PT）的序列。我们发现浓度x <0.6的晶体有四个固相，而浓度高于这些浓度的三相。Fe（iii）浓度已使用SEM技术进行了估算。我们已经发现IV→III PT的Tcvers与Fe（iii）摩尔浓度的线性关系。根据获得的结果，已构建了相图。基于介电弛豫，NIR，IR和拉曼光谱以及X射线测量的结果，讨论了结构PT的机理。已经观察到所有分析的混合晶体的介电转换。所有晶体均表现出铁弹性。
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