14175-03-2Relevant articles and documents
Self-assembled light lanthanide oxalate architecture with controlled morphology, characterization, growing mechanism and optical property
He, Hongmei,Zhang, Youjin,Zhu, Wei,Zheng, Ao
, p. 1546 - 1552 (2011/10/01)
Flower-like Sm2(C2O4)3· 10H2O had been synthesized by a facile complex agent assisted precipitation method. The flower-like Sm2(C2O 4)3·10H2O was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, thermogravimetry- differential thermal analysis and photoluminescence. The possible growth mechanism of the flower-like Sm2(C2O4) 3·10H2O was proposed. To extend this method, other Ln2(C2O4)3·nH2O (Ln = Gd, Dy, Lu, Y) with different morphologies also had been prepared by adjusting different rare earth precursors. Further studies revealed that besides the reaction conditions and the additive amount of complex agents, the morphologies of the as-synthesised lanthanide oxalates were also determined by the rare earth ions. The Sm2(C2O4) 3·10H2O and Sm2O3 samples exhibited different photoluminescence spectra, which was relevant to Sm 3+ energy level structure of 4f electrons. The method may be applied in the synthesis of other lanthanide compounds, and the work could explore the potential optical materials.
Formation and characterization of samarium oxide generated from different precursors
Hussein,Buttrey,DeSanto Jr.,Abd-Elgaber,Roshdy, Heba,Myhoub, Ali Y.Z.
, p. 27 - 36 (2008/10/08)
Sm(NO3)3·6H2O and Sm2(C2O4)3· 10H2O were used as precursors for the formation of Sm2O3. Thermal processes involved in the decomposition course of both salts up to 800°C in air were monitored by nonisothermal gravimetry and differential thermal analysis. Intermediates and final solid products were characterized by IR-spectroscopy, X-ray diffraction and scanning electron microscopy. The results showed that Sm(NO3)3·6H2O decomposes completely through nine endothermic mass loss processes. The dehydration occurs through the first four steps at 90, 125, 195, and 240°C, culminating in a crystalline nitrate monohydrate, which subsequently decomposes to Sm(OH)(NO3)2 at 355°C. The latter decomposes rapidly to form a stable and crystalline SmO(NO3) at 460°C, through nonstoichoimetric unstable intermediates. Finally Sm2O3 forms at 520°C. For the oxalate, the dehydration occurs in five steps: the anhydrous oxalate is thermally unstable and immediately decomposes to Sm2O3 at 645°C through two unstable intermediates. The crystalline oxide obtained from the nitrate contains larger pores than the oxide obtained from the oxalate, as indicated from scanning electron microscopy (SEM) results.
Thermal decomposition of rare-earth-doped calcium oxalate. Part 1. Doping with lanthanum, samarium and gadolinium
Patnaik, Usharani,Muralidhar
, p. 261 - 272 (2008/10/09)
The thermal decomposition of calcium oxalate doped with lanthanum, samarium or gadolinium has been investigated using thermogravimetry (TG) and differential thermal analysis (DTA). The kinetics of the decomposition steps have been studied by the non-isothermal TG technique. The doped oxalates decompose in a similar way to pure CaOx. After dehydration, decomposition of doped oxalates proceeds in two overlapping exothermic stages, i.e. decomposition of lanthanide oxalates followed by that of calcium oxalate. Samples heated up to 1000°C reveal the existence of CaO and Ln2O3 in separate phases.
Magnetic susceptibilities of lanthanide(III)-CMPO complexes and lanthanide(III) oxalate complexes
Nakamura,Yoshimura,Nakatani,Miyake
, p. 303 - 305 (2008/10/08)
Lanthanide(III)-CMPO complexes with nitrate ion as counter-ion and lanthanide(III)-oxalate complexes were synthesized. The former complexes were identified as Ln(NO3)3·3CMPO for La(III), Ce(III), Pr(III) and Nd(III), whereas Ln(NOsu
THERMAL ANALYSIS OF THE OXALATE HEXAHYDRATES AND DECAHYDRATES OF YTTRIUM AND THE LANTHANIDE ELEMENTS.
Fuller,Pinkstone
, p. 127 - 142 (2008/10/08)
Simultaneous thermogravimetry and differential thermal analysis data are presented for yttrium and the tervalent lathanide oxalate decahydrates (Y, La - Er excluding Pm) and hexahydrates (Y, Er - Lu). The dehydration and the oxalate and intermediate dioxy
