The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Lingmin Zeng - One of the best experts on this subject based on the ideXlab platform.
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Phase equilibria in the Ag–Dy–Sb system at 400 °C
Journal of Alloys and Compounds, 2003Co-Authors: Lingmin Zeng, Xinyun XieAbstract:Abstract The isothermal section of the Ag–Dy–Sb ternary system at 400 °C has been investigated over the whole concentration range mainly by powder X-ray diffraction with the aid of optical microscopy and scanning electron microscopy. Two new ternary compounds, AgDySb 2 and Ag 5 Dy 7 Sb, were found. The compound AgDySb 2 crystallizes in the Tetragonal Space Group P 4/ nmm (no. 129) with the CuSi 2 Zr structure type and a =0.42656 nm, c =1.04545 nm and z =2. The compound Ag 5 Dy 7 Sb crystallizes in the Tetragonal Space Group P 4/ nbm (no. 125) with the Cu 5 Ho 7 Sb structure type and a =0.622175 nm, c =0.88129 nm and z =1.
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Crystal structure of a new compound Cu5Ho7Sb
Journal of Alloys and Compounds, 2003Co-Authors: Lingmin Zeng, Haibin NingAbstract:Abstract The crystal structure of a new compound, Cu 5 Ho 7 Sb has been determined from X-ray powder diffraction data using the Rietveld method. The investigated compound crystallizes in the Tetragonal Space Group P 4/ nbm (No. 125) with a new structure type and a =0.62008(3) nm, c =0.87807(4) nm and z =1.
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Crystal structure of AgRSb2 (R=Pr, Nd, Gd, Dy, Ho, Er)
Journal of Alloys and Compounds, 2002Co-Authors: Lingmin Zeng, Xinyun Xie, Hugo F. FranzenAbstract:Abstract The crystal structures of the AgRSb2 (R=Pr, Nd, Gd, Dy, Ho, Er) compounds were determined by X-ray powder diffraction using the Rietveld method. The investigated compounds crystallize in the Tetragonal Space Group P4/nmm (No. 129) with the CuSi2Zr structure type.
Friedrich Frey - One of the best experts on this subject based on the ideXlab platform.
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High‐temperature neutron powder diffraction study of ZrSiO4 up to 1900 K
Acta Crystallographica Section B Structural Science, 1992Co-Authors: Z. Mursic, Thomas Vogt, Friedrich FreyAbstract:A high temperature study of synthetic zircon up to 1900K using high resolution neutron powder diffraction in combination with a mirror furnace. Zircon is Tetragonal, Space Group I4 1 /amd, Z=4, a=6.605, c=5.987A.
Gerzon E. Delgado - One of the best experts on this subject based on the ideXlab platform.
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Structural Characterization of Two New Quaternary Chalcogenides: CuCo2InTe4 and CuNi2InTe4
Materials Research, 2016Co-Authors: Gerzon E. Delgado, P. Grima-gallardo, Luis Nieves, Humberto Cabrera, Jennifer R. Glenn, Jennifer A. AitkenAbstract:The crystal structure of the chalcogenide compounds CuCo2InTe4 and CuNi2InTe4, two new members of the I-II2-III-VI4 family, were characterized by Rietveld refinement using X-ray powder diffraction data. Both materials crystallize in the Tetragonal Space Group I4 2m (No. 121), Z = 2, with a stannite-type structure, with the binaries CoTe and NiTe as secondary phases.
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Synthesis and crystal structure of three new quaternary compounds in the system (Cu-III-Se2) 1 - x ZnSex (III=Al, Ga, In), formed by Zn incorporation in Cu-III-Se2 chalcopyrites
Revista Mexicana De Fisica, 2016Co-Authors: Gerzon E. Delgado, P. Grima-gallardo, Miguel QuinteroAbstract:The crystal structure of the chalcogenide alloys CuZnAlSe_(3), CuZnGaSe_(3) and CuZnInSe_(3), new members of the system I-II-III-VI_(3), were characterized using X-ray powder diffraction data. All materials crystallize in the Tetragonal Space Group P_(4) 2c (No 112) with a CuFeInSe_(3)-type structure.
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Crystal structure of CuFe2InSe4 from X-ray powder diffraction
Journal of Alloys and Compounds, 2008Co-Authors: Gerzon E. Delgado, P. Grima-gallardo, Asiloé J. Mora, M. QuinteroAbstract:Abstract The crystal structure of the semiconductor compound CuFe 2 InSe 4 was analyzed using X-ray powder diffraction data. The powder pattern refinedby the Rietveld method was composed of 86.6% of the principal phase CuFe 2 InSe 4 and 13.4% of the binary phase FeSe. CuFe 2 InSe 4 crystallizesin the Tetragonal Space Group I42 ¯ m (no. 121), Z =2, with unit cell parameters a =5.7694(3)A, ˚ c =11.495(1)A, V =382.62(4)A 3 . FeSe crystallizesin the Tetragonal Space Group P 4/ nmm (no. 129), Z =2, and a =3.784(1)A,˚ c =5.502(2)A,˚ V =78.78(4)A˚ 3 . The refinement of 28 instrumental andstructural parameters led to R p =8.2%, R wp =10.7%, R exp =6.7% and S =1.7; R B =9.9% (CuFe 2 InSe 4 ), R B =8.8% (FeSe) for 76 and 36 independentreflections, respectively.© 2006 Elsevier B.V. All rights reserved. PACS: 61.10.Nz; 61.50.Nw; 61.66.Fn Keywords: Semiconductors; Crystal structure; X-ray powder diffraction; Rietveld refinement 1. Introduction The addition of a II–VI binary compound to ternary chal-copyrite structures (I–III–VI
Hansjoachim Lehmler - One of the best experts on this subject based on the ideXlab platform.
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the ullmann coupling reaction a new approach to tetraarylstannanes
Organometallics, 2006Co-Authors: Nadim S Shaikh, Sean Parkin, Hansjoachim LehmlerAbstract:Several iodobenzenes form tetraarylstannanes, in addition to other products, under reaction conditions typically employed for the Ullmann reaction, i.e., activated copper bronze (a copper−tin alloy) and 7 days at 230 °C. The isolated yields of the tetraarylstannanes were low to good (8−58%). Significantly higher yields (54−64%) of tetraphenylstannane were obtained by the direct reaction of iodobenzene with an excess of tin powder (iodobenzene:tin = 1:1 w/w) under the same conditions. Crystal structure analysis reveals that tetrakis(4-carbomethoxyphenyl)stannane crystallizes in a Tetragonal Space Group and has 4 symmetry, which is the case for many symmetrical tetraarylstannanes. However, tetrakis(2,4-dichlorophenyl)stannane, tetrakis(3,4-dichlorophenyl)stannane, and tetrakis(2,4-dimethylphenyl)stannane do not crystallize in a Tetragonal Space Group and do not have real 4 symmetry.
Klaus-jürgen Range - One of the best experts on this subject based on the ideXlab platform.
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Single-crystal structure refinement of the trirutile-type compound Ga2TeO6
Journal of Alloys and Compounds, 1994Co-Authors: Nadia Berand, Klaus-jürgen RangeAbstract:A single-crystal structure analysis for Ga2TeO6 is reported. The compound crystallizes in an inverse trirutile-type structure (Tetragonal, Space Group P42/mnm; a = 4.5594(3), c = 8.970(1) A, c/a = 1.9674, V = 186.47(3) A3, Z = 2). The structure was refined to R = 0.059, Rw = 0.043 for 249 absorption-corrected reflections.
