Huge thermal hysteresis loop and a hidden stable phase in a charge-transfer phase transition ofRb0.64Mn[Fe(CN)6]0.88∙1.7H2O
Huge thermal hysteresis loop and a hidden stable phase in a charge-transfer phase transition ofRb0.64Mn[Fe(CN)6]0.88∙1.7H2O
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DOI：
10.1103/physrevb.73.172415
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发表时间：
2006-05
影响因子：
3.7
通讯作者：
H. Tokoro;S. Miyashita;K. Hashimoto;S. Ohkoshi
中科院分区：
文献类型：
--
作者：
H. Tokoro;S. Miyashita;K. Hashimoto;S. Ohkoshi
The charge-transfer phase transition in ${\mathrm{Rb}}_{0.64}^{\mathrm{I}}{\mathrm{Mn}}^{\mathrm{II}}[{\mathrm{Fe}}^{\mathrm{III}}(\mathrm{CN}{)}_{6}{]}_{0.88}∙1.7{\mathrm{H}}_{2}\mathrm{O}$ exhibits a surprisingly large thermal hysteresis loop of $138\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, i.e., the phase transition temperatures are $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ $(={T}_{1∕2\ensuremath{\downarrow}})$ and $303\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ $(={T}_{1∕2\ensuremath{\uparrow}})$. Switching between ${\mathrm{Fe}}^{\mathrm{III}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{II}}$ and ${\mathrm{Fe}}^{\mathrm{II}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{III}}$ causes this phase transition. When the sample is rapidly cooled, a hidden stable phase of ${\mathrm{Fe}}^{\mathrm{III}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{II}}$ is observed, which relaxes to ${\mathrm{Fe}}^{\mathrm{II}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{III}}$ at $114\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with a warming. A thermodynamical model under thermal equilibrium condition demonstrates this large thermal hysteresis loop and proves the existence of the hidden stable phase.
The charge-transfer phase transition in ${\mathrm{Rb}}_{0.64}^{\mathrm{I}}{\mathrm{Mn}}^{\mathrm{II}}[{\mathrm{Fe}}^{\mathrm{III}}(\mathrm{CN}{)}_{6}{]}_{0.88}∙1.7{\mathrm{H}}_{2}\mathrm{O}$ exhibits a surprisingly large thermal hysteresis loop of $138\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, i.e., the phase transition temperatures are $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ $(={T}_{1∕2\ensuremath{\downarrow}})$ and $303\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ $(={T}_{1∕2\ensuremath{\uparrow}})$. Switching between ${\mathrm{Fe}}^{\mathrm{III}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{II}}$ and ${\mathrm{Fe}}^{\mathrm{II}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{III}}$ causes this phase transition. When the sample is rapidly cooled, a hidden stable phase of ${\mathrm{Fe}}^{\mathrm{III}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{II}}$ is observed, which relaxes to ${\mathrm{Fe}}^{\mathrm{II}}\text{\ensuremath{-}}\mathrm{CN}\text{\ensuremath{-}}{\mathrm{Mn}}^{\mathrm{III}}$ at $114\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with a warming. A thermodynamical model under thermal equilibrium condition demonstrates this large thermal hysteresis loop and proves the existence of the hidden stable phase.