1A15T2 Spin transition in the solid phases of FexNi1-x(ATr)3(NO3)2 (ATr = 4- amino- 1,2,4- triazole)

The effect of Fe2+ substitution by Ni2+ in the complex of iron(II) nitrate with 4- amino- 1,2,4- triazole Fe(ATr)3(NO3)2 on the character of the1A15T2 spin transition (ST) is studied by magnetic susceptibility and calorimetry methods. Solid phases of FexNi1- x(ATr)3(NO3)2 (0.1 ≤ x ≤ 0.9) were synthe...

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Bibliographic Details
Published in:Journal of structural chemistry 1997-01, Vol.38 (4), p.578-584
Main Authors: Shvedenkov, Yu G, Ikorskii, V N, Lavrenova, L G, Drebushchak, V A, Yudina, N G
Format: Article
Language:English
Subjects:
Enthalpy
Ferrous alloys
Iron
Magnetic moments
Magnetic permeability
Solid phases
Spin transition
Transition temperature
Triazoles
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Summary:The effect of Fe2+ substitution by Ni2+ in the complex of iron(II) nitrate with 4- amino- 1,2,4- triazole Fe(ATr)3(NO3)2 on the character of the1A15T2 spin transition (ST) is studied by magnetic susceptibility and calorimetry methods. Solid phases of FexNi1- x(ATr)3(NO3)2 (0.1 ≤ x ≤ 0.9) were synthesized. The temperature dependences of the effective magnetic moment were measured in the range of 78– 360 K. Heat capacities were measured in the range of 210– 340 K for 0.1 ≤ x ≤ 0.5 and in the range of 230– 340 K for 0.6 ≤x ≤ 0.9. As x decreases, the transition temperature (TC), hysteresis (δTC, and transition enthalpy (δH) decrease and the ST is leveled. The results are compared with the data obtained previously for the solid phases of FexZn1- x(ATr)3(NO3)2 (0.01 ≤ x ≤ 0.8). The dependence Μeff(T) is analyzed theoretically in terms of both the domain model and the spin equilibrium model.
ISSN:0022-4766
1573-8779
DOI:10.1007/BF02762740