Crystal structure of the high-T{sub c} superconductor HoSr{sub 2}Cu{sub 2.7}Mo{sub 0.3}O{sub 7.54} by joint time-of-flight neutron/x-ray rietveld refinement

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/0022-4596(95)80016-I· OSTI ID:237558

Harrison, W T.A.; Roliard, S; Jacobson, A J ^[1]

---

1. Univ. of Houston, TX (United States)

The ambient-pressure synthesis, crystal structure, and some properties of HoSr{sub 2}Cu{sub 2.7}Mo{sub 0.3}O{sub 7.54} are described. HoSr{sub 2} Cu{sub 2.7}Mo{sub 0.3}O{sub 7.54} crystallizes as the tetragonal modification of the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (123) high-T{sub c} superconductor structure, and exhibits a superconducting transition temperature of {approximately}30 K. The Cu/Mo cation distribution in HoSr{sub 2}Cu{sub 2.7}Mo{sub 0.3O}{sub 7.54} was established by means of a joint time-of-flight neutron/X-ray Rietveld refinement: The molybdenum ions substitute for copper at both the {open_quotes}chain{close_quotes} [Cu(1)] and square-pyramidal [Cu(2)] sites in roughly equal proportion. The chain layers [atoms Cu/Mo(1) and O(1)] show considerable static disorder in this material. Crystal data: HoSr{sub 2}Cu{sub 2.7}Mo{sub 0.3O}{sub 7.54}, M{sub r} = 660.51, tetragonal, space group P4/mmm (no. 123), a = 3.83107(6) {angstrom}, c = 11.5347(3) {angstrom}, V = 169.296(8) {angstrom}{sup 3}, Z = 1, R{sub p} = 4.21%, R{sub wp} = 5.08%, and {sub {chi}}{sup 2} = 2.45.

• OSTI ID: 237558
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 119; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL PREPARATION
COPPER COMPOUNDS
CRITICAL TEMPERATURE
CRYSTAL STRUCTURE
HIGH-TC SUPERCONDUCTORS
HOLMIUM COMPOUNDS
MOLYBDATES
NEUTRON DIFFRACTION
STRONTIUM COMPOUNDS
TETRAGONAL LATTICES
TIME-OF-FLIGHT METHOD