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P. Z. Si,X. L. Wang,X. F. Xiao,H. J. Chen,X. Y. Liu,L. Jiang,J. J. Liu,Z. W. Jiao,H. L. Ge 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
Cr₂O₃ nanoparticles were prepared via one-step reactive laser ablation of Cr in oxygen. The metastable CrO₂ phase was obtained through the subsequent oxidation of Cr₂O₃ nanoparticles under O₂ with gas pressures of up to 40 MPa. The as-prepared Cr₂O₃ nanoparticles are spherical or rectangular in shape with sizes ranging from 20 nm to 50 nm. High oxygen pressure annealing is effective in producing meta-stable CrO₂ from as-dried Cr₂O₃ nanoparticles, and the Cr₂O₃ nanoparticles exhibit a weak ferromagnetic behavior with an exchange bias of up to 11 mT that can be ascribed to the interfacial exchange coupling between uncompensated surface spins and the antiferromagnetic core. The Cr₂O₃/CrO₂ nanoparticles exhibit an enhanced saturation magnetization and a reduced exchange bias with an increasing faction of CrO₂ due to the elimination of uncompensated surface spins over the Cr₂O₃ nanoparticles when exposed to a high pressure of O₂ and/or possible phase segregation that results in a smaller grain size for both Cr₂O₃ and CrO₂.
Crack-tip constraint analysis of SENB specimen under creep condition
G. C. Jiao,W. Z. Wang,S. J. Tan,C. Yu,Y. Z. Liu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
A higher-order asymptotic C(t)-A2(t)-M approach was used to investigate the crack-tip stress of single edge notched bend (SENB)specimen in a power-law creeping material under plane strain conditions. Comprehensive calculations were made of SENB specimenwith a/W = 0.59 by using higher-order asymptotic C(t)-A2(t)-M approach, higher-order asymptotic C(t)-A2(t) approach and finite elementanalysis; the latter two methods were used to check the constraint significance and the calculation accuracy of C(t)-A2(t)-M approach,respectively. The results show that the stress components qq s obtained from the higher-order asymptotic C(t)-A2(t)-M solution agreedwell with that of finite element analysis, however, which gradually deviated from the results of C(t)-A2(t) approach as the distance faraway from the crack tip for small-scale creep stage.
Robust Magnetic Order of Ce 4f-electrons Coexisting with Superconductivity in CeFeAsO1−xFx
T. Shang,L. Jiao,J. Dai,H. Q. Yuan,F. F. Balakirev,W. Z. Hu,N. L. Wang 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The electrical resistance of CeFeAsO1−xFx (x = 0.06 and 0.08) has been measured in magneticfields up to 40 T. At zero field, the sample with x = 0.06 shows a structural phase transition aroundTS 100 K, followed by a spin-density-wave (SDW) transition around TSDW 30 K. For x =0.08, the structural phase transition is suppressed down to TS 60 K without a clear anomalyassociated with the Fe-SDW transition, and superconductivity shows up at TC 25 K. At lowertemperatures, both samples show a clear resistive peak around TN 4 K, which is associated withthe antiferromagnetic (AFM) transition of Ce 4f-electrons. Strikingly, zero resistance is recoveredupon a further lowering of the temperature to below TN for x = 0.08. Moreover, we found thatthe AFM transition of Ce 4f-electrons at 4 K hardly change when a magnetic field of up to 40 Twas applied. This was true even in the case of x = 0.08, for which the superconductivity had beenpartially suppressed at such a large field.
Electronic properties of graphene on the C-decorated Si(111) surface:An ab initio study
J. Liu,C.Y. He,W. Wang,N. Jiao,C.X. Zhang,L.Z. Sun 한국물리학회 2013 Current Applied Physics Vol.13 No.7
First principles calculations based on the density functional theory are performed to study electronic structures of graphene adsorbed on clean or C-decorated Si(111) surface. Two types of surface reconstructions,2 x 2 and ffiffiffi 3p x 3p , are considered to be decorated by carbon atoms with different concentrations. We find that graphene adsorbed on ideal clean Si(111) surface tends to induce a 2 x 1reconstruction, and its electronic dispersion characteristics are preserved. Moreover, the decoration of carbon atoms on the Si(111) surface can effectively passivate the Si dangling bonds on the surface. Such decoration effects make the carbon deco
X.C. Zhong,D.L. Jiao,H. Zhang,W.Q. Qi,Z.W. Liu,R.V. Ramanujan 한국물리학회 2018 Current Applied Physics Vol.18 No.12
The thermal stability, magnetic and magnetocaloric properties of Gd55Co35M10 (M=Si, Zr and Nb) melts-pun ribbons were studied. The relatively high reduced glass transition temperature (Tx1/Tm > 0.60) and low melting point (Tm) resulted in excellent glass forming ability (GFA). The Curie temperatures (TC) of melt-spun amorphous ribbons Gd55Co35M10 for M=Si, Zr and Nb were 166, 148 and 173 K, respectively. For a magnetic field change of 2 T, the values of maximum magnetic entropy change (−ΔSM)max for Gd55Co35Si10, Gd55Co35Zr10 and Gd55Co35Nb10 were found to be 2.86, 4.28 and 4.05 J kg−1K−1, while the refrigeration capacity (RC) values were 154, 274 and 174 J kg–1, respectively. The RCFWHM values of amorphous alloys Gd55Co35M10 (M=Si, Zr and Nb) are comparable to or larger than that of LaFe11.6Si1.4 crystalline alloy. Large values of (−ΔSM)max and RC along with good thermal stability make Gd55Co35M10 (M=Si, Zr and Nb) amorphous alloys be potential materials for magnetic cooling operating in a wide temperature range from 150 to 175 K, e.g., as part of a gas liquefaction process.