摘要 沸腾磷酸结晶制备的镧系磷酸盐 LnPO4·H2O(Ln:La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu 和 Y)的热分解特性已提出解决方案。根据对 DTA 和 DTG 曲线观察到的影响,当加热到 1000 °C 时,磷酸盐可分为两组:(a)第一组包括六方(La→Tb)和正交 Dy 磷酸盐,( b) 第二组由四方 (Ho→Lu) 和 Y 磷酸盐组成。组 (a) 的特征是两个低于 300 °C 的吸热线,与脱水有关,以及一个高于 700 °C 的放热线,与六方/斜方晶向单斜晶的转变有关。多晶型转变的温度随着镧系元素原子序数从 900 °C (Tb, Dy) 的增加而增加。(b)组在很宽的温度范围(100-600°C)内脱水,即使在 950°C 加热后仍保持四方晶体结构。然而,增加的结晶度、a 轴和 c 轴的收缩以及 IR 光谱的差异表明 (Ho→Lu)
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。
Synthesis of Metal Phosphates Using SiP2O7
作者:Carlos E. Bamberger、George M. Begun、Dale E. Heatherly
DOI:10.1111/j.1151-2916.1983.tb10575.x
日期:1983.11
The reaction of SiP/sub 2/O/sub 7/ with rare-earth fluorides and oxides and with UO/sub2/ proceeds at high temperatures (1000/sup 0/ to 1200/sup 0/C) to convert the rare-earth and uranium compounds to ortho- or pyro-phosphates. In these reactions between intimately mixed powders, very finely segregated SiO/sub2/ is formed and distributed throughout the phosphates. This procedure may be useful for
Facile sonochemical synthesis and photoluminescent properties of lanthanide orthophosphate nanoparticles
作者:Cuicui Yu、Min Yu、Chunxia Li、Xiaoming Liu、Jun Yang、Piaoping Yang、Jun Lin
DOI:10.1016/j.jssc.2008.10.023
日期:2009.2
lanthanide orthophosphate LnPO4 (Ln=La, Ce, Pr, Nd, Sm, Eu, Gd) products have nanorod bundles morphology, while the tetragonal LnPO4 (Ln=Tb, Dy, Ho) samples prepared under the same experimental conditions are composed of nanoparticles. HRTEM micrographs and SAED results prove that these nanostructures are polycrystalline in nature. The possible formation mechanism for LnPO4 (Ln=La–Gd) nanorod bundles
通过在环境温度下对无机盐水溶液进行便捷,快速,高效的超声辐照,系统地合成了均匀的镧系元素正磷酸盐Ln PO 4(Ln = La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho)纳米颗粒没有任何表面活性剂或模板的条件。X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),高分辨率透射电子显微镜(HRTEM),选定区域电子衍射(SAED),光致发光(PL)光谱以及动力学衰减被用来表征样品。扫描电镜(SEM)和透射电镜(TEM)显示六方结构镧系正磷酸盐Ln PO 4(Ln= La,Ce,Pr,Nd,Sm,Eu,Gd)产品具有纳米棒束形态,而在相同实验条件下制备的四方Ln PO 4(Ln = Tb,Dy,Ho)样品则由纳米颗粒组成。HRTEM显微照片和SAED结果证明,这些纳米结构本质上是多晶的。提出了Ln PO 4(Ln = La–Gd)纳米棒束的可能形成机理。还使用相同的合成方法制备了Eu
Modified Pechini synthesis of La, Ce, and Pr orthophosphates and characterization of obtained powders
In this study, lanthanum, cerium, and praseodymium orthophosphates were synthesized by the modified Pechini method. The compounds were analyzed using XRD, TG/DSC, FTIR methods, and the isothermal nitrogen adsorption technique. The results showed that mesoporous and nanocrystalline powders can be synthesized by this method. Moreover, due to the limited formation of lanthanide polyphosphates on the surface of the powders the modified Pechini method allows better control of the compound stoichiometry in comparison with the commonly used method of phosphates precipitation from solutions rich in H3PO4.
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