Structural phase transitions in Co(ClO4)2.6H2O in temperature range 100–375 K

Phase Transitions and Water Dynamics of [Co(H2O)6](ClO4)2 and [Mn(H2O)6](BF4)2 Studied by Neutron Scattering Methods

“…For [Co(H20 ) 6](C104)2 we detected by DSC [3] phase transitions at the temperatures: T C1 = 348 K, TC2 = 241 K, and T C3 = 156 K. However, the tem peratures o f the phase transitions were also ascribed to 263 K and 215 K by adiabatic calorimetry [5], to 354 K, 243 K, and 155 K by EPR [6,7], to 156 K by the Mössbauer effect [8], to 160 K by NMR [9], to 166 K by magnetic susceptibility [10,11], to 333 K, 240 K and 166 K by IR and RS [12], and to 344 K, 295 K, 243 K, 182 K, 155 K, 136 K and 121 K by X-ray and dielectric permittivity [13]. For [Mn(H20 ) 6](BF4)2 we detected by DSC [4] the phase transitions at the following temperatures: T r , = 250 K, TC7 = 223 K and T C3 = 162 K.…”