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Titolo:
Study of the synthesis process and structural defects in Y-123 superconducting systems by positron experiment
Autore:
Chen, ZP; Zhang, JC; Cheng, GS; Li, XC; Zhang, XS;
Indirizzi:
Zhengzhou Inst Light Ind, Dept Math & Phys, Zhengzhou 450002, Peoples R China Zhengzhou Inst Light Ind Zhengzhou Peoples R China 450002 eoples R China Henan Normal Univ, Dept Phys, Xinxiang 453002, Peoples R China Henan Normal Univ Xinxiang Peoples R China 453002 53002, Peoples R China
Titolo Testata:
ACTA PHYSICA SINICA
fascicolo: 3, volume: 50, anno: 2001,
pagine: 550 - 555
SICI:
1000-3290(200103)50:3<550:SOTSPA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
CHI
Soggetto:
OXYGEN-DEFICIENT YBA2CU3O7-DELTA; ELECTRON-STRUCTURE; VACANCY PROPERTIES; ANNIHILATION; LIFETIME;
Keywords:
positron lifetime spectrum; YBa2Cu3O7-delta superconductor; sintering procedure; crystal structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Chen, ZP Zhengzhou Inst Light Ind, Dept Math & Phys, Zhengzhou 450002, Peoples R China Zhengzhou Inst Light Ind Zhengzhou Peoples R China 450002 China
Citazione:
Z.P. Chen et al., "Study of the synthesis process and structural defects in Y-123 superconducting systems by positron experiment", ACT PHY C E, 50(3), 2001, pp. 550-555

Abstract

Using positron annihilation,X-ray diffraction and scanning electron microscopy experiments,the structural characteristics and preparation techniques for YBa2Cu3O7-delta systems are systematically studied. The results show that,for the samples sintered at 950 degreesC,the orthorhombic disorder increases with the duration of sintering time. On the whole,with the increase ofsintering temperature and time, the positron lifetime increases until it reaches a saturation value. It is proved that,under the condition of 920-950degreesC for 12-72 h,the structural characteristics and superconductivity of Y-123 have good stability. The changes of defect with the sintering temperature and time are also discussed. This experimental results indicate that the positron experiment shows good stability and reliability.

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Documento generato il 01/04/20 alle ore 23:06:21