Formation of flower-like MgO crystal and its effect on the photoluminescence of Mg-cBN ceramics
作者： P.F. Wang , Zh.H. Li , Y.M. Zhu , K. Gao , K.Y. Wang
DOI: 10.1016/J.JALLCOM.2009.11.167
关键词: Photoluminescence 、 Sintering 、 Boron nitride 、 Crystal 、 Mineralogy 、 Crystal structure 、 Analytical chemistry 、 Materials science 、 Microstructure 、 Crystal growth 、 Annealing (metallurgy)
摘要: Abstract Cubic boron nitride (cBN) ceramics were prepared by sintering cBN micro-powder with magnesium at high temperature and high-pressure conditions (HTHP). Following the sintering, annealed in nitrogen atmosphere. Surface microstructure, phase compositions photoluminescence of examined comprehensively using scanning electronic microscopy, energy-dispersive spectrometer, X-ray diffraction, fluorescence spectrophotometer. Experimental results indicated that flower-like MgO crystals clustered surface after annealing 1100 °C for 2 h. Oxygen vacancies increased emission peak near 400 nm. The 317 nm was attributed to oxygen due scavenging O from Mg. optical vibrational eigenmodes hBN resulted phonon replicas spectra interactions between LO crystal lattice, or grains.
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