Crystal structure of Na2MMgP2O8 (M: Ba, Sr, Ca) orthophosphates and their luminescence properties activated by Eu2+; analogous structural behaviors of glaserite-type phosphates and silicates
Crystal structure of Na2MMgP2O8 (M: Ba, Sr, Ca) orthophosphates and their luminescence properties activated by Eu2+; analogous structural behaviors of glaserite-type phosphates and silicates
复制标题
Na2MMgP2O8（M：Ba、Sr、Ca）正磷酸盐的晶体结构及其Eu2激活的发光性能；
DOI：
10.1016/j.jssc.2011.10.011
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发表时间：
2011
影响因子：
3.3
通讯作者：
Chihiro Matsuda
中科院分区：
文献类型：
--
作者：
Y. Yonesaki;Chihiro Matsuda
X射线粉末衍射数据和振动光谱的Rietveld精修证实了通过标准固相反应制备的Na{sub 2}MMgP{sub 2}O{sub 8} (M: Ba, Sr, Ca)的晶体结构。它们具有玻璃榴石型层状结构。 Na{sub 2}MMgP{sub 2}O{sub 8} 对于 M=Ba 具有三角 P3-bar 形式，对于 M=Sr 和 Ca 具有单斜 P2{sub 1}/c 形式。观察到的结构转变类似于相应的层状原硅酸盐 M{sub 3}MgSi{sub 2}O{sub 8}。基于 Eu{sup 2+} 离子的 5d-4f 电子跃迁，Eu{sup 2+} 掺杂的 Na{sub 2}MMgP{sub 2}O{sub 8} 在紫外线激发下表现出强烈的蓝色至紫色发射。发射特性对M{sup 2+}引起的结构转变和随后的位点对称性变化非常敏感。 - 图解摘要：从X射线粉末衍射技术解析的晶体结构的角度讨论了Na{sub 2}MMgP{sub 2}O{sub 8} (M: Ba, Sr, Ca)的发射特性。亮点：通过固相反应制备了黑色右指尖晶石型Na{sub 2}MMgP{sub 2}O{sub 8}（M：Ba、Sr、Ca）。 Na{sub 2}MMgP{sub 2}O{sub 8} 的黑色右指针晶体系统会根据 M{sup 2+} 尺寸而变化。黑色右指针Eu{sup 2+}掺杂的Na{sub 2}MMgP{sub 2}O{sub 8}在紫外线照射下呈现蓝色至紫色发射。
Rietveld refinements of X-ray powder diffraction data and vibrational spectroscopy have confirmed the crystal structure of Na{sub 2}MMgP{sub 2}O{sub 8} (M: Ba, Sr, Ca) prepared by a standard solid state reaction. They have glaserite-type layered structure. Na{sub 2}MMgP{sub 2}O{sub 8} has a trigonal P3-bar form for M=Ba, and monoclinic P2{sub 1}/c forms for M=Sr and Ca. The observed structural transition is analogous to the corresponding layered orthosilicate M{sub 3}MgSi{sub 2}O{sub 8}. Eu{sup 2+}-doped Na{sub 2}MMgP{sub 2}O{sub 8} exhibits an intense blue to violet emission under ultraviolet excitation, based on 5d-4f electron transition of Eu{sup 2+} ions. The emission character is very sensitive to the structural transition induced by M{sup 2+} and the subsequent site symmetry changes. - Graphical abstract: Emission properties of Na{sub 2}MMgP{sub 2}O{sub 8} (M: Ba, Sr, Ca) are discussed from the viewpoint of the crystal structure solved by X-ray powder diffraction technique. Highlights: Black-Right-Pointing-Pointer Glaserite-type Na{sub 2}MMgP{sub 2}O{sub 8} (M: Ba, Sr, Ca) has been prepared by a solid state reaction. Black-Right-Pointing-Pointer Crystal system of Na{sub 2}MMgP{sub 2}O{sub 8} changes, depending on M{sup 2+} size. Black-Right-Pointing-Pointer Eu{sup 2+}-doped Na{sub 2}MMgP{sub 2}O{sub 8} exhibits blue to violet emission under ultraviolet irradiation.