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Titolo:
High-resolution transmission electron microscopy study of ordered or disordered arrangements of Cu, C and N in the charge-reservoir blocks of a series of high-T-c superconductors: (Cu, C, N)Sr2Can-1CunOy (n=1-6)
Autore:
Anan, Y; Asaka, T; Takayama-Muromachi, E; Kimoto, K; Matsui, Y;
Indirizzi:
Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan Natl Inst Mat Sci Tsukuba Ibaraki Japan 3050044 a, Ibaraki 3050044, Japan
Titolo Testata:
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICSELECTRONIC OPTICAL AND MAGNETIC PROPERTIES
fascicolo: 11, volume: 81, anno: 2001,
pagine: 1847 - 1860
SICI:
1364-2812(200111)81:11<1847:HTEMSO>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
O SYSTEM; OXYCARBONATE SUPERCONDUCTORS; HIGH-PRESSURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Matsui, Y Natl Inst Mat Sci, Adv Mat Lab, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan Natl Inst Mat Sci 1-1 Namiki Tsukuba Ibaraki Japan 3050044 Japan
Citazione:
Y. Anan et al., "High-resolution transmission electron microscopy study of ordered or disordered arrangements of Cu, C and N in the charge-reservoir blocks of a series of high-T-c superconductors: (Cu, C, N)Sr2Can-1CunOy (n=1-6)", PHIL MAG B, 81(11), 2001, pp. 1847-1860

Abstract

A series of new oxycarbonitrate superconductors, (Cu, C,N)Sr2Can-1CunOy, (n = 1-6), recently prepared in a Sr-Ca-Cu C-N-O system under a high pressure of 5.6 GPa, are examined by electron diffraction and high-resolution transmission electron microscopy, to reveal arrangements of Cu and C (N) in thecharge-reservoir blocks (CRBs). Ordered arrangements of Cu and C (N) are observed in the compounds with n = 1-4, and almost random arrangements for those with n = 5-6. In the first two series of compounds, (Cu, C, N)-1201 (n= 1) and (Cu, C, N)-1212 (n = 2), an ordering scheme of -Cu-C(N)-C(N)-C(N)-Cu-with fourfold periodicity is observed, indicating that the ratio of Cu to C (N) in the CRB is 1 to 3. For (Cu, C, N)-1234 (n = 4), with highest T-c of 113 K in the series, the ordering scheme of Cu C(N)-Cu-C(N) Cu with twofold periodicity is observed, indicating that the ratio of Cu to C (N) in the CRB is 1 to 1. Both types of ordering structure coexist in the n = 3 compound, (Cu, C, N)-1223. In the last two members, (Cu, C, N)-1245 (n = 5) and (Cu, C, N)-1256 (n = 6), no evidence of ordering was observed, suggesting that Cu, C and N are distributed almost randomly in the CRBs. Such relations between the ordering scheme and n parameters are also observed locally in the crystals which contain many intergrowth defects.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/08/20 alle ore 15:52:23