Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1815707 | Physica B: Condensed Matter | 2007 | 6 Pages |
Abstract
Amorphous BCN was prepared by chemical solid-state reaction between boracic acid (H3BO3) and melamine (C3N6H6) in mass ratios of H3BO3 to C3N6H6 of 1:2-1:4 and heat treatment at 1273Â K under 10â3Â Pa. The amorphous BCN behave insulating property below 890Â K, but semiconductor conductivity above 890Â K and show different conductivity-temperature relationships in temperature ranges of 913-963 and 963-1083Â K. The conductive activation energy was calculated to be 0.26-0.34Â eV at 913-963Â K and 1.02-1.10Â eV at 963-1083Â K, implying that the conduction mechanisms are different in the different temperature ranges. Annealed for 40Â min at 1473Â K under 4.0Â GPa, the amorphous BCN with the chemical composition B0.48C0.29N0.23 was prepared in the mass ratio of 1:3 crystallizes into single-phase hexagonal (h-BCN) compound with lattice constants of a=0.2506Â nm and c=0.6652Â nm. Raman scattering peaks were observed at 1330, 1364,1584 and 1617Â cmâ1 in the Raman spectrum (RS) of h-BCN, of which the peaks located at 1330 and 1617Â cmâ1 are assigned to characteristic peaks of the h-BCN.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Suo Zhu Bai, Bin Yao, Guo Zhong Xing, Ke Zhang, Wen-Hui Su,