Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 76, Issue 12, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.76.124707
Keywords
phase separation; two-phase coexistence; phase transition; valence change; volumetric strain
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We present experimental findings showing that for npBifc-(F(1)TCNQ)(3), two phases coexist over a wide temperature interval of 100-150K near the monovalent-to-divalent phase transition temperature. Macroscopic domains of the high-temperature (monovalent) and low-temperature (divalent) phases were detected in the transition temperature region using X-ray diffraction and micro-Raman spectroscopy techniques. The volume fraction of the two domains continuously varied depending upon the temperature. A considerably large volume difference was found between the monovalent and divalent phases. The effect of volumetric strain due to this volume difference is discussed to understand this inhomogeneous state.
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