Thermodynamical Study on Rare Earth L-Isoleucine Chlorate Complexes [RE₂(lle)₄(H₂O)₈](ClO₄)₆ (RE = Nd, Er)

Abstract:

Using perchloric acid, Nd2O3, Er2O3 and L-isoleucine (Ile) as raw materials, two crys-talline compounds of rare earth isoleucine chlorate, [Nd2(Ile)4(H2O)8](ClO4)6 and [Er2(Ile)4(H2O)8](ClO4)6, were synthesized. Their compositions were determined after chemical analysis, IR spectrum study, thermogravimetric (TG) and differential thermal analysis (DTA). By using the RD496-2000 microcalorimeter, the standard enthalpies of formation of the synthesized compounds were obtained according to a pre-designed thermal cycle. Four sets of TG data with different heating rates (2.5 K•min-1, 5 K•min-1, 10 K•min-1 and 15 K•min-1) were obtained. After the exploration of the kinetic data in the non-isothermal thermal decomposition process, the activation energy E, the logarithm of the pre-exponential factor lnA, the reaction order n, and the dynamical equation of the water loss step were derived. Ozawa method was also used to test the obtained dy-namical data.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 1196-1210
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.1196
• Online since: January 2013
• Authors: Chen Chen, Xin Min Wu, Fan Yang
• Keywords: [RE₂(Ile)₄(H₂O)₈](ClO₄)₆ (RE = Nd, Er), Kinetic Equation and Parameters, Standard Enthalpy of Formation

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