Superconducting and Vickers hardness properties of ZnO-added YBCO polycrystalline superconductors
Yükleniyor...
Tarih
2004
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley-V C H Verlag Gmbh
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The effects of ZnO addition on the microstructure and mechanical properties of the YBCO have been investigated through XRD, SEM, EDX, ac susceptibility measurements and the standard Vickers micro-hardness testing method. We have prepared the samples by a conventional solid-state reaction method and used an additive method for the YBCO system (0, 0.5 and 1 wt% of ZnO). The orthorhombic strain Delta = (b - a)/(b + a) increases as the Zn content increases, where a and b are the relevant lattice parameters of the samples. The superconducting transition temperatures and hardness depend on the Zn content of the samples. The hardness is found to be load dependent. From the relation between applied load F and the square of the impression diagonal, d(2), the true hardness, H-0, and the dissipative portion of the indentation load F-0, were derived from the slope and the intercept (at d(2) = 0) of the straight line, respectively. The hardness was increased while the transition temperature decreased with the amount of ZnO addition to YBCO.
Açıklama
Anahtar Kelimeler
Kaynak
Physica Status Solidi B-Basic Solid State Physics
WoS Q Değeri
N/A
Scopus Q Değeri
Q3
Cilt
241
Sayı
2
Künye
closedAccess
