共查询到20条相似文献,搜索用时 46 毫秒
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I. Voznyak Ya. TokaychukV. Hlukhyy T.F. FässlerR. Gladyshevskii 《Journal of Alloys and Compounds》2012,512(1):246-251
Formation of an interstitial solid solution Hf5GaxSn3 (x = 0-1) based on the binary compound Hf5Sn3 (structure type Mn5Si3, Pearson symbol hP16, space group P63/mcm, a = 8.36562(6), c = 5.70775(4) Å from X-ray powder diffraction) was established at 600 °C. The crystal structure (structure type Hf5CuSn3, ordered derivative of Ti5Ga4, hP18, P63/mcm) was refined on X-ray single-crystal diffraction data for three compositions: Hf5Ga0.16(3)Sn3 (a = 8.3288(12), c = 5.6988(11) Å), Hf5Ga0.53(2)Sn3 (a = 8.4205(12), c = 5.7655(12) Å) and Hf5GaSn3 (a = 8.5564(12), c = 5.7859(12) Å). The Ga atoms occupy Wyckoff position 2b at the centres of Hf6 octahedral interstices. 相似文献
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Cheng-Liang Huang Yu-Hua ChienChen-Yi Tai Chi-Yuen Huang 《Journal of Alloys and Compounds》2011,509(9):L150
The microwave dielectric properties and the microstructures of (Mg1−xZnx)Al2O4 (x = 0-0.1) ceramic system prepared by the conventional solid-state route were investigated. The forming of spinel-structured (Mg1−xZnx)Al2O4 (x = 0-0.1) solid solutions was confirmed by the XRD patterns and the measured lattice parameters, which linearly varied from a = b = c = 8.0815 Å for MgAl2O4 to a = b = c= 8.0828 Å for (Mg0.9Zn0.1)Al2O4. By increasing x, the Q × f of (Mg1−xZnx)Al2O4 can be tremendously boosted from 82,000 GHz at x = 0 to a maximum of 156,000 GHz at x = 0.05. The Zn substitution was effective in reducing the dielectric loss without detrimental effects on the ?r and τf values of the ceramics. 相似文献
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Min Zhang Shilie Pan Jian HanYun Yang Liang Cui Zhongxiang Zhou 《Journal of Alloys and Compounds》2011,509(23):6696-6699
A novel dibarium cadmium diborate, Ba2Cd(BO3)2, has been successfully synthesized by standard solid-state reaction. Large sheet-like crystal with size up to 20 mm × 15 mm × 0.7 mm has been obtained using top-seed solution growth method. Ba2Cd(BO3)2 crystallizes in the monoclinic space group C2/m with a = 9.6305(4) Å, b = 5.3626(3) Å, c = 6.5236(2) Å, β = 118.079(3)°, Z = 2. The crystal structure is composed of isolated [BO3] triangles, [CdO6] octahedra and [BaO9] polyhedra. CdO6 are vertex-connected with six BO3 to form infinite ∞[Cd(BO3)2] layers extending in (0 0 1) plane, and two rows of Ba atoms closely occupy two side of ∞[Cd(BO3)2] layers to forming stoichiometric sheets. IR and transmittance spectrum of Ba2Cd(BO3)2 were reported. 相似文献
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