Superconductivity in the A[sub x]NbS[sub 2] intercalation compounds (A = Cs, Rb)

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1105· OSTI ID:6266517

Chen, Baihao; Eichhorn, B; Peng, Jianliang; Greene, R L ^[1]

---

1. Univ. of Maryland, College Park (United States)

Four new A[sub x]NbS[sub 2] phases, where A = Cs, x = 0.34, 0.60; A = Rb, x = 0.33, 0.6, were prepared from Nb and A[sub 2]CO[sub 3], in a CS[sub 2]/Ar atmosphere at 700[degrees]C. The compounds were refined (Rietveld profile analysis) in P6[sub 3]/mmc symmetry. Crystal data were Cs[sub 0.34]NbS[sub 2], a = 3.3452(5) [Angstrom], c = 18.424(5) [Angstrom]; Cs[sub 0.60]NbS[sub 2], a = 3.3539(6) [Angstrom], c = 18.324(1) [Angstrom]; Rb[sub 0.33]NbS[sub 2], a = 3.3425(5) [Angstrom], c = 18.075(2) [Angstrom]; Rb[sub 0.6]NbS[sub 2], a = 3.3462(3) [Angstrom], c = 17.986(2) [Angstrom]. The compounds comprise a 2H-NbS[sub 2] host with trigonal prismatic Nb ions and alkali ions intercalated in trigonally distorted octahedral holes between NbS[sub 2] layers. Increasing the alkali content effects a decrease in the c lattice parameters due to decreases in interlayer S[center dot][center dot][center dot]S separations. Magnetic susceptibility and resistivity measurements indicate metallic behavior for all compounds below room temperature. The Cs phases are bulk type II superconductors (Cs[sub 0.34]NbS[sub 2], [Tc] = 3.0 K, Cs[sub 0.60]NbS[sub 2], [Tc] = 2.0 K). 19 refs., 5 figs., 3 tabs.

• OSTI ID: 6266517
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 103:2; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALI METAL COMPOUNDS
CESIUM COMPOUNDS
CESIUM SULFIDES
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HOLES
IONS
LATTICE PARAMETERS
LAYERS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NIOBIUM COMPOUNDS
NIOBIUM SULFIDES
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
RUBIDIUM COMPOUNDS
RUBIDIUM SULFIDES
SCATTERING
SULFIDES
SULFUR COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYMMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
X-RAY DIFFRACTION