TY - JOUR
T1 - Syntheses and structures of the new quaternary compounds Ba4Nd2Cd3Se10 and Ba4Ln2Cd3S10 (Ln = Sm, Gd, Tb)
AU - Yang, Yuting
AU - Ibers, James A.
N1 - Funding Information:
Use was made of the scanning electron microscope and magnetic susceptibility facilities supported by the National Science Foundation through the Northwestern University Materials Research Center, Grant DMR96-32472. This research was supported by the National Science Foundation through Grant DMR 97-09351. We thank Dr. Mian Zhong Lin, in the Department of Physics, and Dr. Saman Shafaie, in the Department of Chemistry, of Northwestern University for their help.
PY - 2000
Y1 - 2000
N2 - The compounds Ba4Nd2Cd3Se10 and Ba4Ln2Cd3S10 (Ln = Sm, Gd, Tb) have been synthesized at 1173 K with the use of a BaBr2/KBr eutectic flux. These isostructural compounds crystallize as racemic twins in space group Cmc21, of the orthorhombic system in cells of (Ln, Q, a, b, c (Å), T (K)): Nd, Se, 4.3340(9), 18.667(4), 27.376(6), 115; Sm, S, 4.1907(8), 17.931(4), 26.594(5), 153; Gd, S, 4.1726(4), 17.928(2), 26.638(3), 153; Tb, S, 4.1643(8), 17.916(4), 26.581(5), 153. The corresponding R1 indices for the refined structures are 0.053, 0.029, 0.032, and 0.030. The structure comprises [Ln2Cd3Q10 ]4- layers interconnected by Ba atoms. There are LnQ6 octahedra and severely distorted CdQ4 tetrahedra in the structure. Ba4Tb2Cd3S10, which is paramagnetic, obeys the Curie-Weiss law and has an effective magnetic moment of 9.94(3) μ(B). A band gap of 3.0 eV for this material was deduced from its diffuse reflectance spectrum. (C) 2000 Academic Press.
AB - The compounds Ba4Nd2Cd3Se10 and Ba4Ln2Cd3S10 (Ln = Sm, Gd, Tb) have been synthesized at 1173 K with the use of a BaBr2/KBr eutectic flux. These isostructural compounds crystallize as racemic twins in space group Cmc21, of the orthorhombic system in cells of (Ln, Q, a, b, c (Å), T (K)): Nd, Se, 4.3340(9), 18.667(4), 27.376(6), 115; Sm, S, 4.1907(8), 17.931(4), 26.594(5), 153; Gd, S, 4.1726(4), 17.928(2), 26.638(3), 153; Tb, S, 4.1643(8), 17.916(4), 26.581(5), 153. The corresponding R1 indices for the refined structures are 0.053, 0.029, 0.032, and 0.030. The structure comprises [Ln2Cd3Q10 ]4- layers interconnected by Ba atoms. There are LnQ6 octahedra and severely distorted CdQ4 tetrahedra in the structure. Ba4Tb2Cd3S10, which is paramagnetic, obeys the Curie-Weiss law and has an effective magnetic moment of 9.94(3) μ(B). A band gap of 3.0 eV for this material was deduced from its diffuse reflectance spectrum. (C) 2000 Academic Press.
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U2 - 10.1006/jssc.1999.8561
DO - 10.1006/jssc.1999.8561
M3 - Article
AN - SCOPUS:0033660140
SN - 0022-4596
VL - 149
SP - 384
EP - 390
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 2
ER -