LETARD, Jean-François; CHASTANET, Guillaume; TOKORO, Hiroko; OHKOSHI, Shin-Ichi

doi:10.2174/1877944105666150910200534

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LETARD, Jean-François
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHASTANET, Guillaume
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

TOKORO, Hiroko
Université de Tsukuba = University of Tsukuba
The University of Tokyo [UTokyo]

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Current Inorganic Chemistry. 2016-02-16, vol. 6, n° 1, p. 34-39

Bentham Science

Résumé en anglais

The search for hidden phase using photo-induced phase transition is an important challenge in multistable materials. In this work we report the study of Prussian blue analogs of formula RbxMn[Fe(CN)6](x+2)/3. zH2O. For composition of Rb+ above 65 %, a thermal hysteresis loop is observed as a reflect of the electron-transfer phase transition from MnIII (S=5/2)-NC-FeIII (S=1/2) at high temperature (HT phase) to MnIII (S=2)-NC-FeII (S=0) at low temperature (LT phase). At low temperature the HT phase can be thermally quenched up to the T(TIESST) temperature (TIESST = Thermally-Induced Excited Spin-State Trapping) above which it relaxes back to the LT phase. Upon the decrease of Rb+ amount, the thermal hysteresis and the T(TIESST) are getting closer and overlap for values of x below 65 %. For the latter compounds, the phase transition is inhibited and the hysteresis loop is hidden. By this simple consideration we explain the observation of Light-Induced Phase Collapse already reported giving also some trends to obtain new hidden phases.< Réduire

Mots clés en anglais

Hidden phase

phase transition

photomagnetism

prussian blue analogs

Photomagnetism

hidden phase

Prussian Blue Analogs

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Rubidium manganese hexacyanoferrate solid solutions : towards hidden phases

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