Superconductivity and crystalline structure in the Na-W-O system

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

X-ray diffraction analysis, using the Rietveld refinement method, of samples of the NaxWO3 system for 0.2 ≤x≤0.4, prepared at 900°C, shows that for x≥0.28 the samples are a mixture of two phases: one with tetragonal crystalline structure and space group P4/mbm, and the other with cubic crystalline structure and space group Pm3m, with the last one as the majority phase. This result must be taken into account in the models that try to explain the observed variation of the transition temperature to the superconducting state with sodium concentration in this system. In the tetragonal phase, only the sites surrounded by ten WO6 octahedra are occupied by sodium atoms. © 1992.
Original languageAmerican English
Pages (from-to)79-84
Number of pages70
JournalPhysica C: Superconductivity and its Applications
DOIs
StatePublished - 20 Dec 1992
Externally publishedYes

Fingerprint

Superconductivity
superconductivity
Sodium
sodium
Crystalline materials
Rietveld refinement
Transition Temperature
Least-Squares Analysis
X-Ray Diffraction
X ray diffraction analysis
Superconducting transition temperature
transition temperature
Atoms
diffraction
atoms
x rays

Cite this

@article{1edaf68e60e7414ea7973b3d34721540,
title = "Superconductivity and crystalline structure in the Na-W-O system",
abstract = "X-ray diffraction analysis, using the Rietveld refinement method, of samples of the NaxWO3 system for 0.2 ≤x≤0.4, prepared at 900°C, shows that for x≥0.28 the samples are a mixture of two phases: one with tetragonal crystalline structure and space group P4/mbm, and the other with cubic crystalline structure and space group Pm3m, with the last one as the majority phase. This result must be taken into account in the models that try to explain the observed variation of the transition temperature to the superconducting state with sodium concentration in this system. In the tetragonal phase, only the sites surrounded by ten WO6 octahedra are occupied by sodium atoms. {\circledC} 1992.",
author = "A. Garc{\'i}a-Ru{\'i}z and Bokhimi",
year = "1992",
month = "12",
day = "20",
doi = "10.1016/0921-4534(92)90575-W",
language = "American English",
pages = "79--84",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",

}

Superconductivity and crystalline structure in the Na-W-O system. / García-Ruíz, A.; Bokhimi.

In: Physica C: Superconductivity and its Applications, 20.12.1992, p. 79-84.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Superconductivity and crystalline structure in the Na-W-O system

AU - García-Ruíz, A.

AU - Bokhimi, null

PY - 1992/12/20

Y1 - 1992/12/20

N2 - X-ray diffraction analysis, using the Rietveld refinement method, of samples of the NaxWO3 system for 0.2 ≤x≤0.4, prepared at 900°C, shows that for x≥0.28 the samples are a mixture of two phases: one with tetragonal crystalline structure and space group P4/mbm, and the other with cubic crystalline structure and space group Pm3m, with the last one as the majority phase. This result must be taken into account in the models that try to explain the observed variation of the transition temperature to the superconducting state with sodium concentration in this system. In the tetragonal phase, only the sites surrounded by ten WO6 octahedra are occupied by sodium atoms. © 1992.

AB - X-ray diffraction analysis, using the Rietveld refinement method, of samples of the NaxWO3 system for 0.2 ≤x≤0.4, prepared at 900°C, shows that for x≥0.28 the samples are a mixture of two phases: one with tetragonal crystalline structure and space group P4/mbm, and the other with cubic crystalline structure and space group Pm3m, with the last one as the majority phase. This result must be taken into account in the models that try to explain the observed variation of the transition temperature to the superconducting state with sodium concentration in this system. In the tetragonal phase, only the sites surrounded by ten WO6 octahedra are occupied by sodium atoms. © 1992.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026981987&origin=inward

UR - https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=0026981987&origin=inward

U2 - 10.1016/0921-4534(92)90575-W

DO - 10.1016/0921-4534(92)90575-W

M3 - Article

SP - 79

EP - 84

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

ER -