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

Lefter, Constantin and Tricard, Simon and Peng, Haonan and Molnar, Gabor and Salmon, Lionel and Demont, Philippe and Rotaru, Aurelian and Bousseksou, Azzedine Metal Substitution Effects on the Charge Transport and Spin Crossover Properties of [Fe1–xZnx(Htrz)2(trz)](BF4) (trz = Triazole). (2015) Journal of Physical Chemistry C, vol. 119 (n° 16). pp. 8522-8529. ISSN 1932-7447

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Official URL: http://dx.doi.org/10.1021/acs.jpcc.5b01117

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.

Item Type:Article
Additional Information:Thanks to the American Chemical Society. The definitive version is available at http://pubs.acs.org The original PDF of the article can be found at Journal of Physical Chemistry C website : http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b01117
HAL Id:hal-01160143
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universitatea Stefan cel Mare Suceava - USU (ROMANIA)
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Deposited By: cirimat webmestre
Deposited On:04 Jun 2015 13:34

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