Hydrothermal Synthesis, Crystal Structure, and Properties of one Three-Dimensional Heteropolytungstate Framework Formed by Lacunary Keggin Cluster Unit

2010 ◽  
Vol 40 (3) ◽  
pp. 200-206
Author(s):  
Ying Chen ◽  
Baibin Zhou ◽  
Zhanhua Su ◽  
Zhifeng Zhao
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Three Dimensional ◽  
Structure And Properties ◽  
Cluster Unit

Hydrothermal synthesis, crystal structure and properties of three-dimensional Co(ii)-4f heterometallic–organic frameworks

CrystEngComm ◽  
2012 ◽  
Vol 14 (24) ◽  
pp. 8689 ◽  
Author(s):  
Shu-Ju Wang ◽  
Yan-Wen Tian ◽  
Gang Xiong ◽  
Li-Xin You ◽  
Fu Ding ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Three Dimensional ◽  
Structure And Properties

K3Eu5(PO4)6: hydrothermal synthesis, crystal structure and photoluminescence properties

2019 ◽  
Vol 75 (7) ◽  
pp. 883-890 ◽  
Author(s):  
Ya-Li Xue ◽  
Ai-Yun Zhang ◽  
Xiao-Yang Han ◽  
Xiao-Qi Cui ◽  
Ling Deng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Uv Light ◽  
Three Dimensional ◽  
Visible Region ◽  
Monoclinic Space Group ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Strong Luminescence ◽  
Light Excitation

An anhydrous orthophosphate, K3Eu5(PO4)6 (tripotassium pentaeuropium hexaphosphate), has been prepared by a high-temperature solid-state reaction combined with hydrothermal synthesis, and its crystal structure was determined by single-crystal X-ray diffraction analysis (SC-XRD). The results show that the compound crystallizes in the monoclinic space group C2/c and the structure features a three-dimensional framework of [Eu5(PO4)6]∞, with the tunnel filled by K+ ions. The IR spectrum, UV–Vis spectrum and luminescence properties of polycrystalline samples of K3Eu5(PO4)6, annealed at temperatures of 650, 700, 750, 800 and 850 °C, were investigated. Although with a full Eu3+ concentration (9.96 × 1021 ions cm−3), the self-activated phosphor K3Eu5(PO4)6 shows s strong luminescence emission intensity with a quantum yield of 37%. Under near-UV light excitation (393 nm), the series of samples shows the characteristic emissions of Eu3+ ions in the visible region from 575 to 715 nm. The sample sintered at 800 °C gives the strongest emission and its lifetime sintered at 800 °C (1.88 ms) is also the longest of all.

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