Piezoresistive Effect in the [Fe(Htrz)2(trz)](BF4) Spin Crossover Complex

Andrei Diaconu (1) , Simona-Lacramioara Lupu (1) , Ionela Rusu (1) , Ioan-Marian Risca (1) , Lionel Salmon (2) , Gábor Molnár (2) , Azzedine Bousseksou (2) , Philippe Demont (3) , Aurelian Rotaru (1)

1 USU - Universitatea Stefan cel Mare Suceava
2 LCC - Laboratoire de chimie de coordination
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

We report on the effect of hydrostatic pressure on the electrical conductivity and dielectric permittivity of the [Fe(Htrz)2(trz)](BF4) (Htrz = 1H-1,2,4,- triazole) spin crossover complex. Variable-temperature and -pressure broad-band impedance spectrometry revealed a piezoresistive effect of more than 1 order of magnitude for pressures as low as 500 bar, associated with a large pressure-induced hysteresis of 1700 bar. The origin of the piezoresistive effect has been attributed to the pressure-induced spin state switching in the complex, and the associated P,T phase diagram was determined.

Mots clés: Piezoresistive Effect; Spin Crossover Complex

Domaines: Matériaux

Andrei Diaconu, Simona-Lacramioara Lupu, Ionela Rusu, Ioan-Marian Risca, Lionel Salmon, et al.. Piezoresistive Effect in the [Fe(Htrz)2(trz)](BF4) Spin Crossover Complex. Journal of Physical Chemistry Letters, 2017, 8 (13), pp.3147-3151. ⟨10.1021/acs.jpclett.7b01111⟩. ⟨hal-01556504⟩