Premium
Silicon‐29 Solid‐State MAS NMR Investigation of Selective Area Laser Deposition Silicon Carbide Material
Author(s) -
Harrison Shay,
Xie Xiangqun,
Jakubenas Kevin J.,
Marcus Harris L.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02227.x
Subject(s) - silicon carbide , materials science , silicon , magic angle spinning , carbide , microstructure , magic angle , deposition (geology) , analytical chemistry (journal) , crystallography , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , solid state , composite material , optoelectronics , chemistry , organic chemistry , physics , paleontology , sediment , biology
The microstructure of silicon carbide fabricated from the gas‐phase‐based, laser‐driven selective area laser deposition (SALD) process has been characterized by X‐ray diffraction and solid‐state 29 Si NMR techniques with magic angle spinning (MAS). X‐ray patterns reveal the characteristic spectrum of pure ß, cubic silicon carbide polytype while NMR shows a ß‐SiC pattern with additional peaks. To determine the source of the extra peaks, a comparative evaluation of commercially available silicon carbide powders, both alpha‐ and ß‐SiC, was undertaken with NMR. Spin‐lattice relaxation time measurements ( T 1 ) were also carried out to determine the polytype morphology of the SALD deposit. The results showed an NMR spectrum that appears to be a combination of alpha and ß polytypes. Microtwinning is advanced as a possible explanation for this phenomenon.