en
Scientific article
English

Interplay between the spin transition and the crystallographic phase transition in the Fe(II) spin-crossover system [Zn1-xFex(ptz)6](BF4)2 (x = 0.1, 1; ptz = 1-propyltetrazole)

Published inJournal of physics and chemistry of solids, vol. 57, no. 11, p. 1743-1750
Publication date1996
Abstract

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↓ = 128 K and Tc↑ = 135 K) from RImage above Tc↓ to PImage 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 = 125 ± 2 K) but now without a hysteresis. The corresponding interaction constant Γ is 170 cm−1. In the diluted system [Zn1−xFex(ptz)6](BF4)2, X = 0.1, the spin transition is gradual with T1/2 = 95 ± 2 K. From the shift of T1/2 towards high temperatures with external pressure a value for ΔVHL0 of 26 Å3 molecule−1 is obtained. Pressures above 250 bar induce a crystallographic phase transition even in the diluted system, as a result of which the spin transition is discontinuous. The interplay between the thermal spin transition and the crystallographic phase transition in the neat and the diluted system is discussed consistently.

Keywords
  • Inorganic compounds
  • High pressure
  • Phase transitions
  • Thermodynamic properties
Research group
Citation (ISO format)
JEFTIC, Jelena, ROMSTEDT, Harald, HAUSER, Andreas. Interplay between the spin transition and the crystallographic phase transition in the Fe(II) spin-crossover system [Zn1-xFex(ptz)6](BF4)2 (x = 0.1, 1; ptz = 1-propyltetrazole). In: Journal of physics and chemistry of solids, 1996, vol. 57, n° 11, p. 1743–1750. doi: 10.1016/0022-3697(96)00033-9

Technical informations

Creation09/21/2009 4:10:54 PM
First validation09/21/2009 4:10:54 PM
Update time03/14/2023 3:12:38 PM
Status update03/14/2023 3:12:38 PM
Last indexation01/15/2024 6:52:02 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack