New Quaternary Chalcogenides Ba LnMQ3 ( Ln = Rare Earth or Sc; M = Cu, Ag; Q= S, Se) : II. Structure and Property Variation vs Rare-Earth Element
Some new quaternary compounds of the type Ba LnMQ 3 ( Ln = rare earth or Sc; M = Cu, Ag; Q = S, Se) have been synthesized by the reaction of the constituent binary chalcogenides and elements at 1000°C. The crystal structures of two of these compounds have been determined by single-crystal X-ray diff...
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Published in | Journal of solid state chemistry Vol. 110; no. 2; pp. 337 - 344 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Inc
1994
|
Online Access | Get full text |
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Summary: | Some new quaternary compounds of the type Ba
LnMQ
3 (
Ln = rare earth or Sc;
M = Cu, Ag;
Q = S, Se) have been synthesized by the reaction of the constituent binary chalcogenides and elements at 1000°C. The crystal structures of two of these compounds have been determined by single-crystal X-ray diffraction techniques and are isostructural. Crystal data: BaErCuS
3—space group
D
17
2h —
Cmcm,
M= 464.32,
Z = 4 ,
a = 3.987(1),
b = 13.377(3),
c = 10.101(2) Å (
T = 115 K),
V = 538.7(4) Å
3,
R
w (
F
2) = 0.095 for 848 observations and 24 variables,
R(
F) = 0.037 for 840 observations having
F
2
0 > 2σ (
F
2
0); BaYAgSe—space group
D
17
2h —
Cmcm,
M = 571.0,
Z = 4,
a = 4.239(1),
b = 14.030(2),
c = 10.636(2) Å (
T = 115 K),
V = 632.6(2) Å
3,
R
w (
F
2) = 0.057 for 645 observations and 24 variables,
R(
F) = 0.023 for 595 observations having
F
2
0 > 2σ(
F
2
0). These two compounds adopt the layered KZrCuS
3 structure type. The layers, which are separated by Ba
2+ ions, consist of edge-sharing octahedral chains and corner-sharing tetrahedral chains. The other compounds synthesized crystallize either with this same structure or with that of β-BaLaCuSe
3, a slightly distorted variation, which is isostructural with Eu
2CuS
3. The diffuse reflective UV-visible spectra of several of these compounds have been measured. From magnetic susceptibility measurements, both BaNdCuS
3 and BaGdCuS
3 show Curie-Weiss behavior, whereas BaCeCuS
3 and BaCeCuSe
3 show in addition temperature-independent paramagnetism. |
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ISSN: | 0022-4596 1095-726X |
DOI: | 10.1006/jssc.1994.1177 |