THERMAL AND X-RAY STUDIES ON MIXED METAL OXALATES - (NH4)LN(III)U(IV)(C2O4)(4)CENTER-DOT-8H(2)O (LN = LA, CE, PR, ND TB)

Mudher KDS.; Chadha AK.; Venugopal V.; Krishnan K.

首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >THERMAL AND X-RAY STUDIES ON MIXED METAL OXALATES - (NH4)LN(III)U(IV)(C2O4)(4)CENTER-DOT-8H(2)O (LN = LA, CE, PR, ND TB)

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THERMAL AND X-RAY STUDIES ON MIXED METAL OXALATES - (NH4)LN(III)U(IV)(C2O4)(4)CENTER-DOT-8H(2)O (LN = LA, CE, PR, ND TB)

机译：混合金属草酸盐的热和X射线研究-（NH4）LN（III）U（IV）（C2O4）（4）CENTER-DOT-8H（2）O（LN = LA，CE，PR，ND TB）

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Five mixed metal oxalates of lanthanides and uranium of the formula (NH4)Ln(III)U(IV)(C2O4)(4) . 8H(2)O were prepared and characterised by chemical, infrared spectroscopy, X-ray diffraction and thermal methods. The X-ray powder diffraction data of all the compounds were indexed on an orthorhombic unit cell. Thermal decomposition of the compounds proceeded with the loss of water molecules below 475 K followed by decomposition in the temperature range of 625 to 655 K to give Ln(2)O(2)CO(3) and UO2+x as intermediate products. The intermediate products reacted above 975 K to form solid solutions of mixed oxides having a fluorite structure. Activation energy values were derived for the dehydration of lanthanum and terbium compounds. Lattice parameters of the fluorite phases of the mixed oxides formed by heating the compounds in air, argon and N-2/H-2 have been determined. (C) 1997 Elsevier Science B.V. [References: 14]

机译：式（NH4）Ln（III）U（IV）（C2O4）（4）的镧系元素和铀的五种混合金属草酸盐。制备了8H（2）O，并通过化学，红外光谱，X射线衍射和热方法进行了表征。所有化合物的X射线粉末衍射数据在正交晶胞上标引。化合物的热分解过程是损失低于475 K的水分子，然后在625至655 K的温度范围内分解，从而得到Ln（2）O（2）CO（3）和UO2 + x作为中间产物。中间产物在975 K以上反应形成具有萤石结构的混合氧化物的固溶体。得出了镧和ter化合物脱水的活化能值。已经确定了通过在空气，氩气和N-2 / H-2中加热化合物而形成的混合氧化物的萤石相的晶格参数。（C）1997 Elsevier Science B.V. [参考：14]

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来源
《Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems》 |1997年第2期|共7页
作者
Mudher KDS.; Chadha AK.; Venugopal V.; Krishnan K.;
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正文语种 eng
中图分类物理化学（理论化学）、化学物理学;
关键词
Lanthanides; Mixed oxalates; Thermal; Uranium(iv); X-ray diffraction; Decomposition;

机译：镧系;混合草酸盐;热;铀（iv）;X射线衍射;分解;

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1. THERMAL AND X-RAY STUDIES ON MIXED METAL OXALATES - (NH4)LN(III)U(IV)(C2O4)(4)CENTER-DOT-8H(2)O (LN = LA, CE, PR, ND TB) [J] . Mudher KDS., Chadha AK., Venugopal V., Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems . 1997,第1a2期

机译：混合金属草酸盐的热和X射线研究-（NH4）LN（III）U（IV）（C2O4）（4）CENTER-DOT-8H（2）O（LN = LA，CE，PR，ND TB）
2. U(IV)/LN(III) unexpected mixed in polymetallic oxalato complexes. Part II. Substitution of U(IV) for Ln(III) in the new oxalates (N2H5)Ln(C2O4)(2) center dot nH(2)O (Ln = Nd, Gd) [J] . Chapelet-Arab B, Nowogrocki G, Abraham F, International Journal of Quantum Chemistry . 2005,第10期

机译：U（IV）/ LN（III）意外混入多金属草酸酯络合物中。第二部分用U（IV）取代新草酸盐（N2H5）Ln（C2O4）（2）中心点nH（2）O中的Ln（III）（Ln = Nd，Gd）
3. U(IV)/Ln(III) mixed site in polymetallic oxalato complexes. Part III: Structure of Na[Yb(C2O4)(2)(H2O)] center dot 3H(2)O and the derived quadratic series (NH4+)(1-x)[Ln(1-x)U(x) (C2O4)(2)(H2O)] center dot (3+x) H2O, Ln = Y, Pr-Sm, Gd, Tb [J] . Chapelet-Arab B, Duvieubourg L, Nowogrocki G, International Journal of Quantum Chemistry . 2006,第12期

机译：多金属草酸酯络合物中的U（IV）/ Ln（III）混合位点。第三部分：Na [Yb（C2O4）（2）（H2O）]中心点3H（2）O的结构和导出的二次序列（NH4 +）（1-x）[Ln（1-x）U（x）（ C2O4）（2）（H2O）]中心点（3 + x）H2O，Ln = Y，Pr-Sm，Gd，Tb
4. Study of the Carbothermal Reduction Reaction ofAmmonium of niobium Oxalate(NH4)3[NbO(C2O4)3nH2O in the production of NbC [C] . K. K. P. Gomes , F. F. P. de Medeiros, S. A. de Oliveira, World congress of chemical engineering . 2001

机译：草酸铌（NH4）3 [NbO（C2O4）3nH2O的氨生产中NbC的碳热还原反应研究
5. STUDIES ON THE USE OF SURFACTANT SYSTEMS IN ANALYTICAL CHEMISTRY. PART I. THE DETERMINATION OF THE DISSOCIATION CONSTANTS OF OXINE AND 2-METHYLOXINE IN THE PRESENCE OF MICELLE-FORMING SURFACTANTS. PART II. THE DETERMINATION OF SOME OF METAL IONS WITH OXINE AND 2-METHYLOXINE IN ANIONIC, CATIONIC AND NON-IONIC SURFACTANTS. PART III. THE DETERMINATION OF NITRITE WITH 2-METHYLOXINE IN CATIONIC SURFACTANT. PART IV. THE DETERMINATION OF METAL IONS WITH. [D] . TSAO, FU-PAO. 1981

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6. Heterometallic Octanuclear NiII4LnIII4 (Ln = Y Gd Tb Dy Ho Er) ComplexesContaining NiII2LnIII2O4 Distorted Cubane Motifs: Synthesis Structure andMagnetic Properties [O] . Pankaj Kalita, Joydeb Goura, Juan Manuel Herrera, 2018

机译：杂金属八核NiII4LnIII4（Ln = YGdTbDyHoEr）配合物包含NiII2LnIII2O4扭曲的古巴图案：合成结构和磁性能
7. Synthesis, Structures, and Luminescent Properties of Sodium Rare-Earth Metal(III) Chloride Oxotellurates(IV), Na2Ln3Cl3TeO34(Ln= Sm, Eu, Gd, Tb, Dy, and Ho) [O] . Dmitri O. Charkin, Sabine Zitzer, Stefan Greiner, 2017

机译：稀土金属（III）氯化钠（IV），Na2LN3Cl3 TEO3 4（LN = SM，EU，GD，TB，Dy和HO）的合成，结构和发光性能

THERMAL AND X-RAY STUDIES ON MIXED METAL OXALATES - (NH4)LN(III)U(IV)(C2O4)(4)CENTER-DOT-8H(2)O (LN = LA, CE, PR, ND TB)

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