Boron-substituted carbon powder, BxC1-x with x up to 0.17, has been successfully synthesized by hot filament chemical vapor deposition. The boron concentration in prepared BxC1-x samples can be controlled by varying the relative proportions of methane and diborane. X-ray diffraction, transmission electron microscopy, and electron energy loss spectrum confirm the successful synthesis of an amorphous BC5 compound, which consists of 10―20 nm particles with disk-like morphology. Thermogravimetry measurement shows that BC5 compound starts to oxidize ap-proximately at 620℃ and has a higher oxidation resistance than carbon.
HU QianKuWU QingHuaSUN GuangLUO XiaoGuangXU BoYU DongLiHE JuLong
We extensively explore the high-pressure structures of InBi by using a newly developed particle swarm optimization algorithm.An orthorhombic Imma structure is discovered to be stable from 43.7 GPa to 107.9 GPa,ruling out the previously speculated cubic structure.Further increasing the pressure,we find a tetragonal P4/nmm structure which is energetically more favourable from 107.9 GPa to 200 GPa.Especially,the tetragonal P4/nmm structure is known to occur at high pressure in the structures of ZnO and MgTe.We also predict this structure to be a high-pressure structure of ZnTe.Thus the tetragonal P4/nmm structure may be a universal high-pressure structure of the II-VI and the III-V compounds.
＜正＞It has been proved that the quenched glass has similar structure with chemically comparable magma, so the s...
JIANG Xi~(1,2),ZHOU Wen-ge~1,XIE Hong-sen~1,LIU Yong-gang~1,FAN Da-wei~1,WAN Fang~1 1.Institute of Geochemistry,Chinese Academy of Science,Guiyang 550002,China
