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In the [Fe(ptz)6](BF4)2 ( ptz= 1-propyltetrazole) spin-crossover system, the thermal spin transition is accompanied by a first order crystallographic phase transition ( Tc↓ = 128KandTc↑ = 135K) from R3¯above Tc↓ to P1¯at low temperatures (Wiehl L., Acta Cryst. B49, 289 (1993)). The high-symmetry phase can be super-cooled, in which case the spin transition is still complete and quite steep ( T1/2 =...
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