Na_2BaMg(PO_4 )_2:synthesis, crystal structure and europium photoluminescence properties

作     者：Amal Boukhris Mourad Hidouri Benoit Glorieux Mongi Ben Amara 

作者机构：UR:Inorganic MaterialsFaculty of ScienceUniversity of Monastir Institute for Condensed Matter Chemistry of BordeauxCNRS University of Bordeaux I87Avenue of Dr.A.Schweitzer33608 Pessac-CedexFrance 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2013年第31卷第9期

页      面：849-856页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 

主　　题：phosphate 31p NMR crystal structure europium photoluminescence rare earths 

摘      要：Na2BaMg（PO4）2 was synthesized and characterized by X-ray diffraction, differential thermal analysis （DTA）, 31p NMR spectroscopy and photoluminescence measurements. This compound crystallized in the P3 ml space group of the trigonal system with the parameters of equivalent hexagonal cell a=0.5305（1） nm and c=0.6986（3） nm. The structure showed a perfect isotipysm with the mineral glaserite KaNa（SO4）2. Thus, it exhibited a lamellar framework which could be described as the stacking along the [001] direc- tion of [MgP2O84-]∞ layers of comer sharing MgO6 polyhedra and PO4 tetrahedra. The Ba2＋ cations were located within the interlayer space, while the Na＋ ones were found in large cavities bound to the layers. The DTA analysis showed that this compound melt con- gruently at 1385 K. The 31p NMR spectrum was consistent with the presence of a single phosphorus site in the structure. Optical properties were investigated for the 5% doped Eu3＋ and Eu2＋ phases. The trivalent europium was used as a local probe, replacing bar- ium while the divalent europium was used to examine whether this material could be used as an optical applications.