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首页> 美国政府科技报告 >Crystal Structure and Fluorescence Lifetime of Potassium Neodymium Orthophosphate, K3Nd(PO4) sub 2. A New Laser Material.
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Crystal Structure and Fluorescence Lifetime of Potassium Neodymium Orthophosphate, K3Nd(PO4) sub 2. A New Laser Material.

机译：正磷酸钕钾，K3Nd（pO4）2的晶体结构和荧光寿命。一种新型激光材料。

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Crystals of a new high-Nd-concentration laser material, K3Nd(PO4)2, have been grown both from the melt and from a KF-KCl flux. Single-crystal x-ray diffraction analysis shows the structure to be monoclinic with space group P21/m, Z = 2, and cell parameters a = 9.532(2)A, Beta = 5.631(3)A, c = 7.444(3)A. Beta = 90.95(2) giving a Nd concentration of 5.00 x 10 to the 21st power cm -3. The basic structural units are isolated PO4 tetrahedra and isolated NdO7 decahedra. The NdO7 decahedra each connect six PO4 tetrahedra to form two-dimensional Nd(PO4)23- sheets in the a-b plane, with K atoms inserted along the c-axis between thees sheets. Each PO4 tetrahedron is connected to three NDO7 decahedra; half the tetrahedra share an edge with a decahedron, giving a short Nd-Nd separation of 4.873 A. Of the seven O ions surrounding each Nd ion, six are near inversion positions. The radiative lifetime of Nd3+ions in this structure is quite long because of the small deviation from inversion symmetry, but concentration quenching is much stronger than in other structures with isolated Nd-O polyhedra. The measured fluorescence lifetime decreases form 460 sec in K3Nd0.005La0.995(PO4)2 to 21 sec in K3Nd(PO4)2. (Author)

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