Appendix_A.fm Page 18 Friday, October 22, 2004 1:09 PM
Elements Handbook Phase Diagram of Carbon
106 Group 4A Diamond(s) 105 104 Liquid 103 Physical Properties 102 Graphite(s)
Pressure (atm) 101 • Group 4A elements are all Vapor 100 solids at room temperature. 0 2000 4000 6000 • The metallic properties of Temperature (C ) 2 Carbon | known since 6 4 Group 4A elements increase C ancient times Carbon from carbon to lead. 12.011 Graphite is more stable than diamond • Diamond, graphite, and at STP, but the activation energy is 2 Silicon | discovered in 14 8 buckminsterfullerene are too high for diamond to change to Si 4 1824 by Jöns Jacob three allotropes of carbon. graphite at these conditions. Silicon Berzelius 28.086
2 Melting and Boiling Points Density 32 8 Germanium | discovered 18 in 1886 by Clemens Ge 4 Germanium Winkler 4827 12 11.34 72.59 5000 bp ) 3 C)