S. Hammami, S. Sebai, D. Jegouso, V. Reita, N. Boudjada, A. Megriche
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引用次数: 1
摘要
在合适的合成条件下,采用固相反应法制备了NaGd(PO3)4 (NGP)信号晶体。通过XRD谱图测定了样品的结构细化程度和纯度。结果表明,NaGd(PO3)4化合物在p21 /n空间群的单斜晶系中结晶,晶胞参数为a=7.174(1) a, b=13.033(2) a, c=9.781(1) a, β=90.65(2)°,V=914.47(20) A3, Z=4。红外光谱和拉曼光谱也表明NaGd(PO3)4的磷酸多面体具有非环对称性。给出了差热分析。这种化合物在852°C之前是热稳定的。本文报道了聚磷酸钆的磁化率随温度的变化规律,并进行了相应的磁化强度测量。该聚磷酸盐表现出顺磁响应,无磁相变,有效磁矩接近于相应的自由Gd3+离子。研究了Gd3+的发光特性。由于Gd3+离子在273 nm处发生6P7/2→8S7/2跃迁,NGP的发射光谱在315 nm处呈现出强波段。证实了Gd3+在164和254 nm激发下的光子级联发射(PCE)。
Magnetic and Photon Cascade Emission of Gd3+ of NaGd(PO3)4 Monocrystal Under Appropriate Synthesis Conditions
A signal crystal of NaGd(PO3)4 (NGP) was successfully grown with the solid-state reaction method under appropriate synthesis conditions. Structure refinements and the purity of the samples were determined by XRD patterns. It reveals that NaGd(PO3)4 compound crystallizes in the monoclinic system with P 21/n space group and with cell parameters a=7.174(1) A, b=13.033(2) A, c=9.781(1) A, β=90.65(2)°, V=914.47(20) A3 and Z=4. The IR and Raman spectra also indicated that the phosphoric polyhedra of NaGd(PO3)4 has a acyclic symmetry. Differential thermal analysis is given. This compound is thermally stable until 852°C. The magnetic susceptibilities of gadolinium polyphosphate as a function of temperature are reported along with corresponding magnetization measurements. This polyphosphate displays a paramagnetic response, without magnetic phase transitions, and with effective magnetic moments close to those of the corresponding free Gd3+ ions. The luminescence proprieties of Gd3+ was investigated. The emission spectra NGP exhibit intense band at 315 nm due to 6P7/2 →8S7/2 transition of Gd3+ ions when excited at 273 nm. The photon cascade emission (PCE) of Gd3+ has been proved at 164 and 254 nm excitation.