Two crystalline forms exist, α and β; β form is more stable. Prepn and properties: E. Krause, A. von Grosse in Die Chemie der metall-organischen Verbindungen, (Gebrüder Borntraeger, Berlin, 1937) pp 258-262; J. G. Aston et al., J. Am. Chem. Soc. 63, 2343 (1941); S. Tannenbaum et al., ibid. 75, 3753 (1953). Dielectric properties: A. P. Altshuller, L. Rosenblum, ibid. 77, 272 (1955). Temperature dependence of magnetic susceptibility, 1H, and 13C chemical shifts: F. G. Morin et al., J. Magn. Reson. 48, 138 (1982). Thermodynamic properties: W. V. Steele, J. Chem. Thermodyn. 15, 595 (1983). Use in chemical vapor deposition of films of silicon carbide, q.v.: N. Herlin et al., J. Phys. Chem. 96, 7063 (1992); A. Grill, V. Patel, J. Appl. Phys. 85, 3314 (1999). Definition of 1H resonance of TMS as the NMR primary standard: R. K. Harris et al., Pure Appl. Chem. 73, 1795 (2001).