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首页> 外文期刊>Journal of Solid State Chemistry >Flux crystal growth, structure, magnetic and optical properties of a family of alkali uranium(IV) phosphates
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Flux crystal growth, structure, magnetic and optical properties of a family of alkali uranium(IV) phosphates

机译：碱晶体（IV）磷酸盐系列的助熔剂晶体生长，结构，磁性和光学性质

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摘要

A family of alkali uranium(IV) phosphates, AU(2)(PO4)(3) (A = Li - Cs), was synthesized as single crystals by the reaction of US2 and (NH4)(2)HPO4 in the respective ACl (A = Li - Cs) flux contained in a sealed fused-silica tube at 850 degrees C, and as phase pure powders from a similar reaction using UF4 as the uranium source. AU(2)(PO4)(3) (A = Li - Rb) crystallize in the NaTh2(PO4)(3) (NTP) structure type with monoclinic space group C-2/c and consist of a 3D structure that features a framework composed of edge- and corner-sharing polyhedra. The cesium analogue, CsU2(PO4)(3), crystallizes in a different structure with space group P2(1)/n that is related to the NaZr2(PO4)(3) (NZP) structure type and consists of a framework composed of corner-sharing polyhedra. Two new alkali uranium phosphates, Li2U(PO4)(2) and Cs4U4(P2O7)(5), were also grown as single crystals at 700 degrees C. Li2U(PO4)(2) was isolated in approximately 30% yield based on uranium. Li2U(PO4)(2) crystallizes in space group P2(1)/c exhibiting a layered structure while Cs4U4(P2O7)(5), crystallizes in space group P2(1)/n in a new structure type featuring a 3D framework. The magnetic susceptibilities and the field dependent magnetizations were measured for AU(2)(PO4)(3) (A = Li, Na, K and Cs); all compounds exhibited negative Weiss temperatures with no obvious antiferromagnetic transition. Optical properties were measured by UV-vis and IR spectroscopy.
机译：通过US2和（NH 4）（2）HPO4在各种ACL中的反应合成一系列碱铀（IV）磷酸酯，Au（2）（PO4）（3）（a = Li-CS），作为单晶合成单晶（a = li-cs）通量在850℃的密封熔融二氧化硅管中含有，并且作为使用UF4作为铀源类似反应的相纯粉末。 Au（2）（PO4）（3）（a = li-rb）在Nath2（Po4）（3）（NTP）结构型中结晶，用单斜晶间空间组C-2 / C组成，并由具有特征A的3D结构组成由边缘和角落分享多面体组成的框架。铯类似物，CSU2（PO4）（3），在不同的结构中结晶，其空间组P2（1）/ N与NaZR2（PO4）（3）（NZP）结构类型相关，并且由由此组成的框架组成角落共享多面体。两种新的碱铀磷酸盐，Li2U（PO4）（2）和CS4U4（P2O7）（5）也被生长为700℃的单晶，Li 2U（PO4）（2）以铀的约30％产率分离出来。 Li2U（PO4）（2）在表现出分层结构的空间组P2（1）/ c中结晶，而CS4U4（P2O7）（5），以具有3D框架的新结构类型的空间组P2（1）/ N结晶。测量磁性敏感性和场依赖性磁化，用于Au（2）（PO4）（3）（a = li，Na，K和Cs）;所有化合物都表现出负湿度温度，没有明显的反铁磁过渡。通过UV-Vis和IR光谱测量光学性质。

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