BaTi(Si, Ge)3O9 の相安定性と発光特性
作者： Yoshihiro TAKAHASHI , Kenji KITAMURA , Nobuo IYI , Satoru INOUE
关键词: Octahedron 、 Ionic radius 、 Crystallography 、 Materials science 、 Spectral line 、 Benitoite 、 Mineralogy 、 Photoluminescence 、 Phase (matter)
摘要: The BaTiSi 3-x Ge x O 9 crystalline phases were synthesized, and their phase-stability photoluminescent (PL) properties investigated. benitoite tetragermanate-type crystallized in the range of x= 0.75-1.5 2.0-3.0, respectively. It was suggested that 4+ occupies octahedral Ti site due to closeness each ionic radii. diffuse-reflection spectra revealed an increase oxygen-defect center by substitution phase. Although 2.25 0.75 phase showed efficient blue PL at room temperature, intensity decreased drastically with increasing x, eventually BaTiGe 3 indicated a very weak spite almost same structure as benitoite, is, absolutely-isolated TiO 6 unit ring. reduction BaTi (Si, Ge) caused center.
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