Oxygen Content of Silicon Single Crystals

1957 ◽  
Vol 28 (8) ◽  
pp. 882-887 ◽  
Author(s):  
W. Kaiser ◽  
P. H. Keck
Keyword(s):  
Single Crystals ◽  
Oxygen Content

The stability of dislocation networks under various oxygen-doping conditions in superconducting Bi2Sr2CaCu2Oy single crystals and their influence on the flux pinning properties

1994 ◽  
Vol 52 ◽  
pp. 802-803
Author(s):  
Y. Feng ◽  
X. Y. Cai ◽  
R. J. Kelley ◽  
D. C. Larbalestier
Keyword(s):  
Single Crystals ◽  
Oxygen Content ◽  
Basal Plane ◽  
Flux Pinning ◽  
Pinning Centers ◽  
Before And After ◽  
Anomalous Peak ◽  
Basal Plane Dislocation ◽  
The Stability ◽  
Further Development

The issue of strong flux pinning is crucial to the further development of high critical current density Bi-Sr-Ca-Cu-O (BSCCO) superconductors in conductor-like applications, yet the pinning mechanisms are still much debated. Anomalous peaks in the M-H (magnetization vs. magnetic field) loops are commonly observed in Bi2Sr2CaCu2Oy (Bi-2212) single crystals. Oxygen vacancies may be effective flux pinning centers in BSCCO, as has been found in YBCO. However, it has also been proposed that basal-plane dislocation networks also act as effective pinning centers. Yang et al. proposed that the characteristic scale of the basal-plane dislocation networksmay strongly depend on oxygen content and the anomalous peak in the M-H loop at ˜20-30K may be due tothe flux pinning of decoupled two-dimensional pancake vortices by the dislocation networks. In light of this, we have performed an insitu observation on the dislocation networks precisely at the same region before and after annealing in air, vacuumand oxygen, in order to verify whether the dislocation networks change with varying oxygen content Inall cases, we have not found any noticeable changes in dislocation structure, regardless of the drastic changes in Tc and the anomalous magnetization. Therefore, it does not appear that the anomalous peak in the M-H loops is controlled by the basal-plane dislocation networks.

Localization effects and pseudogap state in YBa2Cu3O7−δ single crystals with different oxygen content

2006 ◽  
Vol 32 (6) ◽  
pp. 571-575 ◽  
Author(s):  
M. A. Obolenskii ◽  
R. V. Vovk ◽  
A. V. Bondarenko ◽  
N. N. Chebotaev
Keyword(s):  
Single Crystals ◽  
Oxygen Content ◽  
Pseudogap State

Magnetic and magneto-transport properties of NdBaCuO single crystals with varying Nd/Ba substitution and oxygen content

2001 ◽  
Vol 364-365 ◽  
pp. 320-325 ◽  
Author(s):  
N Koshizuka ◽  
A.K Pradhan ◽  
S Shibata ◽  
Y Feng ◽  
T Machi ◽  
...  
Keyword(s):  
Transport Properties ◽  
Single Crystals ◽  
Oxygen Content ◽  
Ba Substitution

Phase segregation and the effect of high pressure on the electro-transport in Y0.95Pr0.05Ba2Cu3O7-δ single crystals

2014 ◽  
Vol 28 (17) ◽  
pp. 1450142 ◽  
Author(s):  
Ruslan V. Vovk ◽  
Georgij Ya. Khadzhai ◽  
Oleksandr V. Dobrovolskiy
Keyword(s):  
High Pressure ◽  
Critical Temperature ◽  
Single Crystals ◽  
Oxygen Content ◽  
Pressure Effect ◽  
Phase Segregation ◽  
Sample Volume ◽  
Pressure Derivative ◽  
High Hydrostatic Pressures ◽  
High Pressure Effect

The effect of high hydrostatic pressures of up to 17 kbar on the basal ab-plane conductivity of lightly praseodymium-doped (x ≈ 0.05) Y 1-x Pr x Ba 2 Cu 3 O 7-δ single crystals with unidirectional twin boundaries (TBs) is investigated. It is observed that the application of a high pressure leads to a doubling of the pressure derivative value dTc/dP for Pr -doped samples compared to non-doped YBa 2 Cu 3 O 7-δ samples with optimal oxygen content. Possible mechanisms of the high pressure effect on the critical temperature Tc and the phase segregation in the sample volume are discussed.

Raman scattering on YBa2Cu3O7−δ single crystals with variable oxygen content

1993 ◽  
Vol 195 ◽  
pp. 359-362 ◽  
Author(s):  
A. Sacuto ◽  
M. Balkanski ◽  
O. Gorochov ◽  
R. Suryanarayanan
Keyword(s):  
Raman Scattering ◽  
Single Crystals ◽  
Oxygen Content

Superconductivity and structure of Bi2Sr2CaCu2Oy single crystals with various oxygen content

1997 ◽  
Vol 282-287 ◽  
pp. 839-840
Author(s):  
Sun Xuefeng ◽  
Wu Wenbin ◽  
Wang Liangbin ◽  
Zhou Guien ◽  
Li Xiao-Guang ◽  
...  
Keyword(s):  
Single Crystals ◽  
Oxygen Content

Incoherent transport and pseudo-gap in HoBa2Cu3O7−δ single crystals with different oxygen content

2008 ◽  
Vol 20 (9) ◽  
pp. 858-860 ◽  
Author(s):  
R. V. Vovk ◽  
M. A. Obolenskii ◽  
A. A. Zavgorodniy ◽  
I. L. Goulatis ◽  
A. I. Chroneos ◽  
...  
Keyword(s):  
Single Crystals ◽  
Oxygen Content ◽  
Incoherent Transport

Oxidation and Reduction of Bi2Sr1.85Cuo6-Y Crystals

1989 ◽  
Vol 169 ◽  
Author(s):  
Edward Sonder ◽  
B. C. Chakoumakos ◽  
B. C. Sales
Keyword(s):  
Quantitative Analysis ◽  
Electrical Properties ◽  
Single Crystals ◽  
Oxygen Content ◽  
Weight Change ◽  
Kinetic Data ◽  
Heat Treatments ◽  
Reduction Kinetics ◽  
Metallic Behavior ◽  
Annealing Temperatures

AbstractThe effects of oxidizing and reducing atmospheres on the oxygen contents and electrical properties of Bi2Sr1.85CuO6‐y single crystals were investigated. As‐grown crystals were normally semiconducting but became metallic and superconducting after heating the crystals for several hours in oxygen at temperatures between 500 and 800°C Previously superconducting crystals were made semiconducting by heat treatments in helium at temperatures between 700 and 780°C. Changes in the oxygen content of the crystals as well as the oxidation and reduction kinetics during the various heat treatments were monitored using standard thermogravimetric techniques. A good correlation was found between the annealing temperatures in oxygen (helium) at which there was an uptake (loss) of oxygen by the crystals, 500°C (700°C), and the onset (loss) of metallic behavior and superconductivity. From isothermal measurents of the weight change as a function of time, it was found that the apparent activation energies for oxidation and reduction were about 0.5 eV and 2.7 eV, respectively. A partial decomposition of the crystals during the various heat treatments, however, precluded a quantitative analysis of the kinetic data.

Sign in / Sign up

Export Citation Format

Share Document