Synthesis and crystal structure of a novel galloarsenate containing the As3O10 5? triarsenate anion: Cs2Ga3As5O18
作者:Kuan-Jiuh Lin、Kwang-Hwa Lii
DOI:10.1039/cc9960001137
日期:——
The synthesis and crystal structure of Cs2Ga3As5O18 in which the Ga atoms are octahedrally and square-pyramidally coordinated are described: the three-dimensional structure is unique and contains the very rare triarsenate anion As3O105â.
Rb3Sc2(AsO4)3is a new cubic phase built up from vertex-sharing ScO6and AsO4building blocks and fused together via Sc–O–As bonds. Variously coordinated Rb+cations occupy lacunae in the Sc/As/O network. Rb3Sc2(AsO4)3is closely related to the perovskite superstructure phase Na4BaCu3F12. Synchrotron radiation methods elucidated the correct primitive unit cell for Rb3Sc2(AsO4)3compared to the apparent body-centered
Synthesis and Characterization of Rb<sub>2</sub>(MoO<sub>2</sub>)<sub>3</sub>(As<sub>2</sub>O<sub>7</sub>)<sub>2</sub>·2H<sub>2</sub>O: The First Rubidium Molybdenum(VI) Diarsenate with a Porous Structure
作者:Kuei-Fang Hsu、Sue-Lein Wang
DOI:10.1021/ic000283w
日期:2000.10.1
The novel framework contains porous [MoO2As2O7] sheets and ellipical tunnels filled with waters of solvation. It is thermally stable up to 873 K, and water absorption is reversible.
新型框架包含多孔 [MoO2As2O7] 片和充满溶剂化水的椭圆隧道。它在高达 873 K 的温度下具有热稳定性,并且吸水是可逆的。
An Experimental and Computational Study of the Electrode Material Olivine-LiCoAsO[sub 4]
作者:M. E. Arroyo-de Dompablo、U. Amador、F. Garcia-Alvarado
DOI:10.1149/1.2168376
日期:——
parameter correction method (LDA + U) allow a correct prediction of the insertion voltage confirming that the insertion voltage in CoAsO 4 is some milivolts lower than in CoPO 4 . Calculated results evidence that replacing the (PO 4 ) -3 group for the less covalent (AsO 4 ) -3 group increases the covalency of the Co-O bond and raises up the energy of the Co d states. As a result, the energy of the Co +3
一种新型橄榄石 LiCoAsO 4 已被成功合成和表征。这种新型化合物在相对于锂电极的平均电压为 4.7 V 时具有电化学活性;这比 LiCoPO 4 的锂脱嵌电压低约 0.1 V,两种材料的一般电化学特性相似。使用带有哈伯德 U 参数校正方法 (LDA + U) 的局部密度近似的计算允许正确预测插入电压,从而确认 CoAsO 4 中的插入电压比 CoPO 4 中的低几毫伏。计算结果表明,将 (PO 4 ) -3 基团替换为共价较低的 (AsO 4 ) -3 基团会增加 Co-O 键的共价并提高 Co d 状态的能量。因此,Co +3 /Co +2 对的能量更接近于 Li + /Li 氧化还原对的能量,并且锂插入发生在较低的电压下。这种微妙的电压变化对于在电解质分解极限附近运行的锂电池非常有益。
Crystal Structure of the Arsenate(V) NaTi<sub>2</sub>[AsO<sub>4</sub>]<sub>3</sub>
作者:Hamdi Ben Yahia、Ute Ch. Rodewald、Rainer Pöttgen
DOI:10.1515/znb-2010-0516
日期:2010.5.1
The arsenate(V) NaTi2[AsO4]3 has been synthesized by a solid-state reaction route using a salt flux. Its structure has been solved and refined from single-crystal X-ray data: NASICON- type, R3̄c, a = 8.8057(5), c = 22.2406(15) Å, Z = 6, wR(F2) = 0.0617 for 576 unique reflections and 30 variables. The NaTi2[AsO4]3structure consists of a three-dimensional framework of corner-sharing AsO4 tetrahedra