Metal Substitution Effects on the Charge Transport and Spin Crossover Properties of [Fe1–xZnx(Htrz)2(trz)](BF4) (trz = Triazole)

Abstract : In this study we analyze the metal substitution effects on the structural, morphological, charge transport, and spin transition properties of the [Fe1–xZnx(Htrz)2(trz)](BF4) (trz = triazole, x = 0, 0.26, or 0.43) compound using electron microscopy, powder X-ray diffraction, optical reflectivity, Raman, FTIR, 57Fe Mössbauer, and broadband (10–2–106 Hz) dielectric spectroscopies. The crystal structure and the morphology of the objects remain nearly unaffected, whereas the thermal spin transition shifts from 362 to 316 K and the thermal hysteresis width decreases from 45 to 8 K for increasing values of x. For each compound the electrical conductivity drops when the iron(II) electronic configuration is switched from the low-spin to the high-spin state. A strong overall decrease in conductivity with increasing Zn concentration is also observed in both spin states. These results, together with the analysis of the charge carrier dynamics, suggest that the ferrous ions participate directly in the charge transport mechanism, explaining the strong spin-state dependence of the electrical properties in this compound.
Document type :
Journal articles
Complete list of metadatas

Cited literature [19 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01160143
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Thursday, June 4, 2015 - 3:34:46 PM
Last modification on : Friday, January 10, 2020 - 9:08:22 PM
Long-term archiving on: Tuesday, April 25, 2017 - 3:16:40 AM

File

Lefter_13962.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Constantin Lefter, Simon Tricard, Haonan Peng, Gabor Molnar, Lionel Salmon, et al.. Metal Substitution Effects on the Charge Transport and Spin Crossover Properties of [Fe1–xZnx(Htrz)2(trz)](BF4) (trz = Triazole). Journal of Physical Chemistry C, American Chemical Society, 2015, 119 (16), pp.8522-8529. ⟨10.1021/acs.jpcc.5b01117⟩. ⟨hal-01160143⟩

Share

Metrics

Record views

157

Files downloads

201