2007 Fiscal Year Final Research Report Summary
Synthesis and Crystal Structure Analysis of Multinary Germanates and Stanates Containing Rare-earth Elements
| Project/Area Number |
17360316
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tohoku University |
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Principal Investigator |
YAMANE Hisanori Tohoku University, Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Professor (20191364)
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| Co-Investigator(Kenkyū-buntansha) |
YAMADA Takahiro Institute of Multidisciplinary Research for Advanced Materials, 多元物質科学研究所, Assistant Professor (10358260)
TAKAHASHI Junichi Institute of Multidisciplinary Research for Advanced Materials, 多元物質科学研究所, Assistant Professor (20261472)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Oxide Ceramics / Novel compounds / Crystal Structure Analysis / Powder X-ray Diffraction / Single Crystal X-ray Diffraction / Solid State Reaction / Luminescence Properties / Stanate Compounds |
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| Research Abstract |
New compounds CaY_2Ge_3O_<10>, CaY_2Ge_4O_<12>, Ca_<0.8>Y_<2.4>Sn_<0.8>O_6, Ca_<1.5>Eu_3Sn_<0.5>O_7 were synthesized in the systems of rare-earth-Ca-Ge/Sn-O by solid state reaction at 1000 - 1500℃ in air. Single crystals of these compounds were obtained by annealing or by slow cooling of partially melted samples. The crystal structures of these new compounds were analyzed by the single crystal X-ray diffraction method. CaY_2Ge_4O_<12> is isotypic with SrNa_2P_4O_<12>, CaY_2Ge_3O_<10> crystallizes in a novel structure where Ca and Y atoms are situated disorderly in three 7-fold coordination sites between isolate germinate groups of triple GeO4 tetrahedra, Ca_<0.8>Y_<2.4>Sn_<0.8>O_6 is isotypic with Mg_3TeO_6, and Ca_<1.5>Eu_3Sn_<0.5>O_7 crystallizes in a novel structure which is related to the structure of B-form Eu_2O_3.
Ca_<0.8>(Y_<1-x>Eu_x)_<2.4>Sn_<0.8>O_6 (0.0〓x<0.3) Ca_<0.8>Y_<2.4>Sn_<0.8-y>Ti_yO_6 (0.0〓y〓0.24) and Ca_<0.8>(Y_<0.9>)Eu_<0.1>)_<2.4>Sn_<0.8-y>Ti_yO_6(0.0〓y〓0.16) were prepared and investigated their luminescence properties. Under ultraviolet light irradiation of 250-264 nm, Ca_<0.8>(Y_<0.9>)Eu_<0.1>)_<2.4>Sn_<0.72>Ti_<0.08>O_6 and Ca_<0.8>(Y_<0.9>Eu_<0.1>)_<2.4>Sn_<0.8>O_6 showed bright red emission of 614 nm due to the ^5Do^<-7>F_2 transition of Eu^<3+>. A broad emission peak of Ti^<4+> centered at 450 nm was observed for Ca_<0.8>Y_<2.4>Sn_<0.72>Ti_<0.08>O_6, suggesting the possibility of energy transfer from Ti^<4+> to Eu^<3+>.
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Research Products
(16 results)
