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- W2028851821 abstract "A novel Keggin-type germanate, (NH 4 ) 9 [Ge 7 O 14 F 3 ] 3 ·1.75H 2 O (I), is hydrothermally synthesized and structurally characterized by X-ray single-crystal diffraction, elemental analysis, XRD, and TG. (I) is tetragonal system with space group I4/mmm and unit cell:<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mi>a</mml:mi><mml:mo>=</mml:mo><mml:mn>28.280</mml:mn></mml:math>(4) Å,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mi>c</mml:mi><mml:mo>=</mml:mo><mml:mn>24.881</mml:mn></mml:math>(5) Å,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mi>V</mml:mi><mml:mo>=</mml:mo><mml:mn>19899</mml:mn></mml:math>(6) Å 3 ,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:mi>Dc</mml:mi><mml:mo>=</mml:mo><mml:mn>1.632</mml:mn><mml:mtext> g</mml:mtext><mml:mo>/</mml:mo><mml:msup><mml:mrow><mml:mtext>cm</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msup></mml:mrow></mml:math>,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:mi>μ</mml:mi><mml:mtext>(Mo K</mml:mtext><mml:mi>α)</mml:mi><mml:mo>=</mml:mo><mml:mn>6.309</mml:mn><mml:msup><mml:mrow><mml:mtext> mm</mml:mtext></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M7><mml:mrow><mml:msub><mml:mi>R</mml:mi><mml:mn>1</mml:mn></mml:msub><mml:mo>=</mml:mo><mml:mn>0.1141</mml:mn></mml:mrow></mml:math>for 2576 reflections with<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M8><mml:mtext>Fo</mml:mtext><mml:mo>></mml:mo><mml:mn>2</mml:mn></mml:math>(Fo). Ge 7 O 14 F 3 entry is defined as the cluster including one octahedron, two edge-sharing triganol bipyramids, and four tetrahedra. Every Ge 7 O 14 F 3 entry links adjacent four Ge 7 O 14 F 3 entries by four tetrahedra. Twelve Ge 7 O 14 F 3 entries construct a cage with all octahedra of Ge 7 O 14 F 3 pointing inside, which can be simplified into Keggin-type cage through Ge 7 O 14 F 3 as the node. The solvent experiment proves that (I) is stable in the water and sensitive to base and acid. The result of XRD shows that the structural water of (I) is easily lost to drop the crystalline. The thermal study indicates that the Keggin-type cage of (I) begins to partly collapse at 200°C and finally changes into GeO 2 ." @default.
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- W2028851821 date "2013-01-01" @default.
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- W2028851821 title "Synthesis, Structure, and Characterization of Keggin-Type Germanate" @default.
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