Thermolysis mechanism of dysprosium hexahydrate nitrate Dy(NO3)3•6H2O and modeling of intermediate decomposition products

被引：6

作者：

Melnikov, P. ^{[1
]}

Arkhangelsky, I. V. ^{[2
]}

Nascimento, V. A. ^{[1
]}

Silva, A. F. ^{[1
]}

de Oliveira, L. C. S. ^{[3
]}

Zanoni Consolo, L. Z. ^{[1
]}

Herrero, A. S. ^{[3
]}

机构：

[1] Univ Fed Mato Grosso do Sul, Sch Med, Campo Grande, MS, Brazil

[2] Moscow MV Lomonosov State Univ, Sch Chem, Moscow 119517, Russia

[3] Univ Fed Mato Grosso do Sul, Sch Chem, Campo Grande, MS, Brazil

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2015年 / 122卷 / 02期

关键词：

Rare earth; Dysprosium nitrate hexahydrate; Thermal decomposition; Oxynitrates; Computer modeling; THERMAL-DECOMPOSITION;

D O I：

10.1007/s10973-015-4811-x

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The thermal decomposition of dysprosium nitrate is a complex process which begins with the simultaneous condensation of the initial monomer Dy(NO3)(3)center dot 6H(2)O into a cyclic hexamer 6[Dy(NO3)(3)center dot 6H(2)O]. This cluster gradually loses water and nitric acid, and intermediate oxynitrates Dy6O7(NO3)(4)center dot 6H(2)O and Dy6O8(NO3)(2)center dot 5H(2)O are formed. At higher temperatures, these products undergo further degradation, lose nitrogen dioxide, water, and oxygen, and finally, after having lost lattice water, are transformed into the cubic form of dysprosium oxide. The models of intermediate oxynitrates represent a reasonably good approximation to the real structures and a proper interpretation of experimental data. The comparison of the potential energies of consecutive oxynitrates permitted an evaluation of their stability. The mechanism was studied by thermal analysis, differential scanning calorimetry, infrared spectroscopy, and X-ray diffraction. The mass losses were related to the vibrational energy levels of the evolved gases.

引用

页码：571 / 578

页数：8

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