Ca-substituted europium(III) phosphate monohydrate obtained through crystallisation from phosphoric acid solution
摘要:
Ca-substituted europium phosphate, obtained through crystallisation from boiling phosphoric acid solution containing 2 M/l of H3PO4, 0.02 M/l of Eu(III) and 0-2 M/l of Ca, has been characterised by X-ray diffraction, Ir-spectroscopy and TGA-DTA analyses. Ca2+ for Eu3+ substitution was limited to 3.7-3.8 wt.% in the solid. All the solids crystallised in hexagonal modification, characteristic of (EuPO4H2O)-H-., While ignited at 950degreesC transformed into monoclinic form. The lattice parameters of the hexagonal (EuPO4H2O)-H-. were affected by the presence of Ca2+ in such a way, that c-axis was significantly increasing, while a-axis was on the same level with a tendency to contraction. Ir-spectra indicate that Ca2+ for Eu3+ substitution results in HPO42- incorporation. The latter compensates the difference in the electric charge between di-valent calcium and tri-valent europium in the solid crystallised. (C) 2003 Elsevier B.V. All rights reserved.
HDEHP assisted solvothermal synthesis of monodispersed REPO<sub>4</sub> (RE = La–Lu, Y) nanocrystals and their photoluminescence properties
作者:Zhen Yang、Guangzhen Yuan、Xiannan Duan、Shuai Liang、Guoxin Sun
DOI:10.1039/c9nj05829j
日期:——
In this paper, a novel method is reported for the preparation of spherical REPO4 particles.
在这篇论文中,报道了一种新颖的方法,用于制备球形REPO4颗粒。
Remarkable thermal stability of Eu(4-phosphonobenzoate): structure investigations and luminescence properties
作者:Jean-Michel Rueff、Nicolas Barrier、Sophie Boudin、Vincent Dorcet、Vincent Caignaert、Philippe Boullay、Gary B. Hix、Paul-Alain Jaffrès
DOI:10.1039/b913590c
日期:——
A new 3D rare-earth hybrid material Eu(p-O(3)PC(6)H(4)COO) has been synthesised by a hydrothermal route from Eu(NO(3))(3) x 5H(2)O and the rigid precursor, 4-phosphonobenzoic acid. The structure of Eu(p-O(3)PC(6)H(4)COO) has been solved by X-ray diffraction on a powder sample and is described as an inorganic network in which both carboxylic and phosphonic acid groups are linked to Eu ions forming
Systematic Synthesis and Characterization of Single-Crystal Lanthanide Orthophosphate Nanowires
作者:Yue-Ping Fang、An-Wu Xu、Rui-Qi Song、Hua-Xin Zhang、Li-Ping You、Jimmy C. Yu、Han-Qin Liu
DOI:10.1021/ja037280d
日期:2003.12.1
systematic synthesis of lanthanide orthophosphate crystals with different crystalline phases and morphologies. It has been shown that pure LnPO(4) compounds change structure with decreasing Ln ionic radius: i.e., the orthophosphates from Ho to Lu as well as Y exist only in the tetragonal zircon (xenotime) structure, while the orthophosphates from La to Dy exist in the hexagonal structure under hydrothermal
已经开发了一种简单的水热法用于系统合成具有不同晶相和形态的镧系元素正磷酸盐晶体。已经表明纯 LnPO(4) 化合物随着 Ln 离子半径的减小而改变结构:即,从 Ho 到 Lu 以及 Y 的正磷酸盐仅存在于四方锆石(磷钇矿)结构中,而从 La 到 Dy 的正磷酸盐存在在水热处理下的六方结构中。获得的六方结构镧系元素正磷酸盐 LnPO(4)(Ln = La、Ce、Pr、Nd、Sm、Eu、Gd、Tb 和 Dy)产品具有线状形态。相比之下,在相同实验条件下制备的四方 LnPO(4)(Ln = Ho、Er、Tm、Yb、Lu、Y)样品由纳米颗粒组成。得到的六边形LnPO(4) (Ln = La --> Tb)可以转化为单斜独居石结构产物,在空气中900℃煅烧后形貌保持不变(六方DyPO(4)是特例,经煅烧转变为四方DyPO(4)),而(Ho--> Lu, Y)PO(4) 的四方结构通过煅烧保持不变。由此产生的
Controlled synthesis of EuPO<sub>4</sub> nano/microstructures and core–shell SiO<sub>2</sub>@EuPO<sub>4</sub> nanostructures with improved photoluminescence
crystallize in different structures. The modelling of the chemical transport experiment was carried out with the program TRAGMIN. By means of different spectroscopic methods structural and electronic influences of the complex anion on the electronic state of the europium ion were investigated. These results were in good agreement with calculations of the electronic structure. The magnetic susceptibility shows
EuPO4、EuAsO4 和 EuSbO4 的晶体通过化学蒸汽传输生长。这些化合物表现出复杂的阴离子,并且它们以不同的结构结晶。化学传输实验的建模是用程序 TRAGMIN 进行的。通过不同的光谱方法,研究了复合阴离子对铕离子电子态的结构和电子影响。这些结果与电子结构的计算非常吻合。磁化率显示了三价铕的典型范弗莱克顺磁性。比热容在 1.9 到 320 K 的范围内测定。这些结果的一致性是基于在 235 到 473 K 的温度范围内通过差示扫描量热法 (DSC) 测定的比热来检查的。