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Albino, M., Clark, L., Lhoste, J., Payen, C., Greneche, J. .-M., Lightfoot, P., Maisonneuve, V. & Leblanc, M. (2017) A magnetisation and Mossbauer study of triazole (M1-x2+Mx3+)M3+ F-5(Htaz)(1-x)(taz)(x) weberites (M = Fe, Co, Mn, Zn, Ga, V). Dalton Trans. 46 5352–5362. 
Added by: Richard Baschera (2017-06-20 14:50:38)   Last edited by: Richard Baschera (2017-06-20 15:28:47)
Type de référence: Article
DOI: 10.1039/c7dt00587c
Numéro d'identification (ISBN etc.): 1477-9226
Clé BibTeX: Albino2017
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Mots-clés: behavior, crystal-structure, diamond framework, ferrimagnetism, frustration, lattice, mnfef5(h2o)2, refinement, spectroscopy, thermal-stability
Créateurs: Albino, Clark, Greneche, Leblanc, Lhoste, Lightfoot, Maisonneuve, Payen
Collection: Dalton Trans.
Consultations : 7/382
Indice de consultation : 1%
Indice de popularité : 0.25%
A series of triazole fluoride weberites (M1-x2+Mx3+)M3+F5(Htaz)(1-x)(taz)(x) is obtained by hydrothermal synthesis. All phases are found to be isostructural to ZnAlF5(Htaz) by powder X-ray diffraction. Weberite structures are prone to induce the magnetic frustration of antiferromagnetic interactions originating from the cationic topology of HTB layers. The (nD) magnetic properties of (0D) Co-Ga, (1D) Zn-Fe, (3D) Fe-Ga, Mn-Fe, Co-Fe and Co-V couples are thus reported. Co2+ or Fe2+ magnetic anisotropy induces a negative magnetisation below T-N and compensation temperatures for Mn-Fe and Co-Fe couples. All iron 3D magnetic phases exhibit high Nel temperatures, between 81 K and 102 K, and large {textbar}theta(P)/T-N{textbar} ratios, signalling strong magnetic frustration. Their cation site occupancies and the deduced (de) protonation states of the amine are accurately determined by Fe-57 Mssbauer spectrometry. In addition, this spectroscopy evidences a subtle effect of the atmosphere that surrounds the samples: the magnetic ordering temperatures TN decrease significantly when the samples are cooled under vacuum with respect to samples that are cooled at ambient pressure. This novel phenomenon, which is highlighted for all studied (3D) triazole iron weberites, is reversible, and thus provides promising perspectives for understanding the underlying mechanism.
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