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首页> 外文期刊>RSC Advances >High-pressure synthesis, crystal structure and photoluminescence properties of a new terbium silicate: Na2Tb1.08Ca2.92Si6O18H0.8
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High-pressure synthesis, crystal structure and photoluminescence properties of a new terbium silicate: Na2Tb1.08Ca2.92Si6O18H0.8

机译：新型硅酸盐的高压合成，晶体结构和光致发光性质：Na2Tb1.08ca2.92si6o18h0.8

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摘要

The crystal properties of a terbium silicate Na2Tb1.08Ca2.92Si6O18H0.8 synthesized at 1 GPa and 800 degrees C using a piston-cylinder apparatus is reported. Our single-crystal X-ray analysis shows that this new compound is triclinic with the space group (P) over bar1 (Z = 1), and its unit-cell parameters are a = 7.056(3) angstrom, b = 7.075(3) angstrom, c = 8.029(3) angstrom, alpha = 102.381(5)degrees, beta = 95.387(6)degrees, gamma = 90.552(6)degrees, and V = 389.6(2)angstrom(3) . This structure consists of octahedral double chains of the compositions [Ca0.875Tb0.125O6] and [Ca0.585Tb0.415O6]. The double chains are linked by tetrasilicate chains via vertex oxygen atoms to form a 3D framework with 6-membered (2 octahedra and 4 tetrahedra) ring channels along the beta-axis where the Na+ cations locate. The luminescence properties of the Na2Tb1.08Ca2.92Si6O18H0.8 phase are also investigated. This phase, with most of its Tb in 3+, emits mainly from one transition, D-5(4) -> F-7(5) (542 and 552 nm). The room temperature fluorescence decay curves are fit well by an exponential function, yielding a lifetime value of about 2.498(7) ms.
机译：报道了使用活塞 - 缸装置在1GPa和800℃合成的铽硅酸铽NA2TB1.08CA2.92SI18H0.8的晶体性质。我们的单晶X射线分析表明，该新化合物是三级，具有谷条（Z = 1）上的空间组（P），其单位电池参数是A = 7.056（3）埃，B = 7.075（3 ）Angstrom，C = 8.029（3）埃，α= 102.381（5）度，β= 95.387（6）度，γ= 90.552（6）度，v = 389.6（2）埃埃斯特罗姆（3）。该结构由组合物的八面体双链组成[Ca0.875tb0.125O6]和[Ca0.585tb0.41506]。双链通过顶硅链通过顶硅链连接，顶点氧原子与沿着β轴定位的β轴的6元（2八面体和4四杜拉）环通道形成3D框架。还研究了NA2TB1.08CA2.92SI6O18H0.8相的发光性质。具有大部分TB的该阶段主要来自一个过渡，D-5（4） - > F-7（5）（542和552nm）发出。室温荧光衰减曲线通过指数函数均匀，产生约2.498（7）MS的寿命值。

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  • 来源
    《RSC Advances》 |2017年第79期|共5页
  • 作者

    Bao Xinjian; Liu Xiaoyang; Liu Xi;

  • 作者单位

    Peking Univ MOE Key Lab Orogen Belts &

    Crustal Evolut Beijing 100871 Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Peking Univ MOE Key Lab Orogen Belts &

    Crustal Evolut Beijing 100871 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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