Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
CRYSTAL-CHEMISTRY OF CUBA2CAN-1CUNOY (N=4, 5, 6) SUPERCONDUCTORS
Autore:
AKIMOTO J; TOKIWA K; IYO A; IHARA H; HAYAKAWA H; GOTOH Y; OOSAWA Y;
Indirizzi:
NATL INST MAT & CHEM RES,1-1 HIGASHI TSUKUBA IBARAKI 305 JAPAN ELECTROTECH LAB TSUKUBA IBARAKI 305 JAPAN
Titolo Testata:
Physica. C, Superconductivity
fascicolo: 3-4, volume: 279, anno: 1997,
pagine: 181 - 196
SICI:
0921-4534(1997)279:3-4<181:COC(56>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-MICROSCOPY; HG;
Keywords:
CUXBA2CAN-1CUNOY; (CU,C)BA2CAN-1CUNOY; SINGLE-CRYSTAL X-RAY STRUCTURE ANALYSIS; CU-BASED SUPERCONDUCTOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
J. Akimoto et al., "CRYSTAL-CHEMISTRY OF CUBA2CAN-1CUNOY (N=4, 5, 6) SUPERCONDUCTORS", Physica. C, Superconductivity, 279(3-4), 1997, pp. 181-196

Abstract

The crystal structures of Cu-based superconductors CuxBa2Can-lCunOy and (Cu,C)BawCan-1CunOy with n=4, 5, 6 have been investigated using intensity data collected on the single-crystal X-ray four-circle diffractometer. The Cu-site occupancy x in the deficient Cu(1)O-2 sheet between two BaO layers increases From 0.62 to 0.73 accompanied by a decreasein the c-axis length in CuxBa2Ca3Cu4Oy. The thickness of the charge reservoir-layer block decreases with decreasing c-axis length from 8.421(4) Angstrom for c=18.0016(39) Angstrom to 8.373(3) Angstrom for c=17.9434(8) Angstrom in CuBa2Ca3Cu4Oy, and from 8.405(2) Angstrom for c=21.1546(14) Angstrom to 8.34(1) Angstrom for c=21.0784(15) Angstrom in CuBa,Ca,Cu,O,, respectively, while the thickness of the superconducting-layer block unchanged in both series. From the results of the structure refinement and chemical analysis, we propose a general formula (CuxC1-x-delta)Ba2Can-1CunOy for these nonstoichiometric compounds, not only for the CuxBa2Can-1CunOy series but also for the carbonate-containing (Cu,C)Ba2Can-1CunOy compounds, where delta equals the vacancy content in the defect site. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 10:02:42