Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.074608
Keywords
structural phase transition; order-disorder type transition; transition metal cyanide
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [21244052, 22013003]
- Grants-in-Aid for Scientific Research [21244052, 22013003, 11J00249] Funding Source: KAKEN
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We investigated the temperature dependence of the crystal structure for a cyano-bridged transition metal compound, Na1.32Mn[Fe(CN)(6)](0.83)center dot 3.6H(2)O, using a synchrotron radiation X-ray powder diffraction. We observed a cubic (Fm (3) over barm; Z = 4) to rhombohedral (R (3) over barm; Z = 4) structural phase transition with decreasing temperature at T-c = 280 K. In the cubic phase, we found that the guest Na ions are at the tetrahedral sites within the cyano-bridged transition metal cubes. We interpret the cubic-rhombohedral structural phase transition in terms of an order-disorder type transition of the Na+ displacement mediated by the dipole-dipole interaction.
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