We have succeeded in growing Pr x Os 4 Sb 12 single crystals under $4 GPa with high Pr-site filling fraction x. The electrical resistance measurements clearly show that the superconducting (SC) transition is sharper and the onset temperatures is lower in the single crystal samples grown under high p
CaB6 single crystals grown under high pressure and hightemperature
β Scribed by Shengwei Xin; Xianyue Han; Shaocun Liu; Zhongyuan Liu; Bo Xu; Yongjun Tian; Dongli Yu
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 899 KB
- Volume
- 313
- Category
- Article
- ISSN
- 0022-0248
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β¦ Synopsis
Millimeter-sized single crystals of CaB 6 are obtained by the reaction of B and Ca under 1 GPa and 950-1150 1C. The structure, chemical composition, and morphologies of the crystals are characterized by X-ray diffraction and field emission scanning electron microscopy with energy dispersion spectrometry. Investigation of the growth mechanism of CaB 6 single crystals indicates that the growth temperature affects the shape of the crystals. Electric resistivity dependence tests of temperatures from 2 to 300 K show that CaB 6 single crystals are conductive materials with semi-metallic behaviors.
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Carbon microspheres (CMSs) were synthesized by chemical vapor deposition in an Ar atmosphere using deoiled asphalt as carbon source. KMnO 4 aqueous solutions with different concentrations were used to oxidize the CMSs to form MnO 2 -coated CMSs (MnO 2 /CMS composites) and H 2 C 2 O 4 solution was us
## Abstract SrB~6~ single crystals are grown from Sr pellets and B powder at 5 GPa and 1300 Β°C (3 h).