使用固态电池Pt,Ni + NiO /(CaO)ZrO 2 / R 2 O 2 S +在900至1480 K的温度范围内测量对应于稀土氧硫化物氧化成其各自的氧硫酸盐的平衡氧电势R 2 O 2 SO 4,Pt,其中R= La,Pr,Nd,Sm,Eu,Gd,Tb或Dy。选择由Ni + NiO混合物组成的参比电极,因为其氧势与此处研究的稀土系统的氧势接近。在恒定温度下,发现将氧硫化物氧化为氧硫酸盐的氧势随稀土元素的原子序数单调增加。氧化反应的“第二定律”焓变也显示出相似的趋势,尽管不确定性更大。基于经验趋势,估计了伴随着Ho,Er和Tm的氧硫化物向其氧硫酸盐转化的标准Gibbs能量的变化。与紧密堆积的氧硫化物相比,较重的三价稀土离子的较高极化能力似乎会使相对开放结构的氧硫化物更不稳定。
Vibrational spectra of mono, di and trimethyl ammonium double sulphates of rare earths Pr, Nd, Ho and Eu
作者:R.S. Jayasree、V.U. Nayar、V. Jordanovska
DOI:10.1016/j.saa.2005.10.043
日期:2006.10
four rare earth (Ho, Eu, Nd and Pr) doublesulphates have been recorded and analysed based on the vibrations of methyl ammonium cations, sulphate anions and water molecules. Formation of hydrogen bonds of the type N-H...O and O-H...O are identified in all the compounds. Bifurcated hydrogen bonds are present in the compounds with dimethyl ammonium cations. The sulphate anions are distorted and occupy a
X-ray photoelectron spectroscopy of rare-earth compounds
作者:Y. Uwamino、T. Ishizuka、H. Yamatera
DOI:10.1016/0368-2048(84)80060-2
日期:1984.1
Abstract A variety of rare-earth (RE) compounds (oxides, sulfates and oxalates) have been studied by X-rayphotoelectronspectroscopy. Except for Eu, the binding energies (BE's) of the RE 3 d and 4 d peaks for the sulfates and oxalates are respectively almost equal to and 1.3–3.1 eV higher than those for the oxides. In the Eu 3 d spectrum of europium(II) oxalate, distinct shake-down satellite peaks
摘要 已经通过 X 射线光电子能谱研究了多种稀土 (RE) 化合物(氧化物、硫酸盐和草酸盐)。除 Eu 外,硫酸盐和草酸盐的 RE 3 d 和 4 d 峰的结合能 (BE) 分别几乎等于和比氧化物高 1.3-3.1 eV。在草酸铕 (II) 的 Eu 3 d 光谱中,存在明显的震荡卫星峰,这些峰的 BE 比母峰低 10 eV。对于氧化物,在 O 1 s 峰的 BE 中发现了明显的差异,并且在 BE 对 1/ R 的图中观察到了一种特定的“倾斜 W”形式(其中 R 是从氧原子到相邻原子的平均距离) RE 原子)和与 RE 氧化还原电位 (ORP) 的关系。在 BE (C 1 s ,
Sulfate Complexation of Trivalent Lanthanides Probed by Nanoelectrospray Mass Spectrometry and Time-Resolved Laser-Induced Luminescence
La(SO4)(2-) was also detected. In addition, time-resolved laser-induced luminescence (TRLIL) was used to study Eu(III) speciation under ionic conditions of 0.02-0.05 M H+ (H2SO4/HClO4) and 0.4-2.0 M Na+ (Na2SO4/NaClO4). The data were interpreted with the species EuSO4+ (log = 3.7(8) +/- 0.1) and Eu(SO4)(2-) (log = 1.5 +/- 0.2). For extrapolating to I = 0, all of the major ions were taken into account through
镧系元素的硫酸盐络合对于预测自然环境中放射性核素的形态非常重要。通过纳米电喷雾电离质谱法(nanoESI-MS)研究了低离子强度(I)的HNO3 / H2SO4水溶液中LaSO4 +(aq)的形成。检测到几种含有LaSO4 +的气态物质。使用简单的特定离子相互作用理论(SIT)公式确定LaSO4 +(aq)的形成常数,并将其外推至I = 0(log = 3.5 +/- 0.3)。该值支持了nanoESI-MS在动力学上不稳定的物种研究中的潜力。还检测到了La(SO4)(2-)物种。此外,时间分辨激光诱导发光(TRLIL)用于研究在0.02-0.05 M H +(H2SO4 / HClO4)和0.4-2.0 M Na +(Na2SO4 / NaClO4)离子条件下的Eu(III)形态。用物质EuSO4 +(log = 3.7(8)+/- 0.1)和Eu(SO4)(2-)(log = 1.5 +/-
Oxygen potentials for the oxidation of rare earth oxysulfides to oxysulfates
作者:K.T. Jacob、R. Akila、A.K. Shukla
DOI:10.1016/0022-4596(87)90016-8
日期:1987.7
those of the rareearth systems studied here. At a constant temperature, the oxygenpotentials for the oxidation of the oxysulfides to oxysulfates are found to increase monotonically with the atomic number of the rareearth element. The “second law” enthalpy change for the oxidation reaction also shows a similar trend, albeit a larger uncertainty. Based on the empirical trend, the changes in the standard
使用固态电池Pt,Ni + NiO /(CaO)ZrO 2 / R 2 O 2 S +在900至1480 K的温度范围内测量对应于稀土氧硫化物氧化成其各自的氧硫酸盐的平衡氧电势R 2 O 2 SO 4,Pt,其中R= La,Pr,Nd,Sm,Eu,Gd,Tb或Dy。选择由Ni + NiO混合物组成的参比电极,因为其氧势与此处研究的稀土系统的氧势接近。在恒定温度下,发现将氧硫化物氧化为氧硫酸盐的氧势随稀土元素的原子序数单调增加。氧化反应的“第二定律”焓变也显示出相似的趋势,尽管不确定性更大。基于经验趋势,估计了伴随着Ho,Er和Tm的氧硫化物向其氧硫酸盐转化的标准Gibbs能量的变化。与紧密堆积的氧硫化物相比,较重的三价稀土离子的较高极化能力似乎会使相对开放结构的氧硫化物更不稳定。
Thermal decomposition behavior of the rare-earth ammonium sulfate R2(SO4)3·(NH4)2SO4
作者:Tsukasa Nagai、Shinji Tamura、Nobuhito Imanaka
DOI:10.1016/j.jssc.2010.04.038
日期:2010.7
Rare-earth ammonium sulfate octahydrates of R2(SO4)3·(NH4)2SO4·8H2O (R=Pr, Nd, Sm, and Eu) were synthesized by a wet process, and the stable temperature region for the anhydrous R2(SO4)3·(NH4)2SO4 form was clarified by thermogravimetry/differential thermal analysis, infrared, Raman, and electrical conductivity measurements. Detailed characterization of these double salts demonstrated that the thermal
通过湿法合成了R 2(SO 4)3 ·(NH 4)2 SO 4 ·8H 2 O(R = Pr,Nd,Sm和Eu)的稀土硫酸铵八水合物。对于无水R 2(SO 4)3 ·(NH 4)2 SO 4形式,通过热重分析/差热分析,红外,拉曼和电导率测量得到澄清。这些复盐的详细表征表明无水R 2的热稳定性Pr,Nd盐与Sm,Eu盐之间的(SO 4)3 ·(NH 4)2 SO 4不同,这些盐的热分解行为与以前的报道有很大不同。