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Diamond is extremely strong owing to its crystal structure, known as diamond cubic, in which each carbon atom has four neighbors covalently bonded to it. Bulk cubic boron nitride (c-BN) is nearly as hard as diamond. Diamond reacts with some materials, such as steel, and c-BN wears less when cutting or abrading such material. [4]
In 2001, a diamond-like-structured c-BC 2 N was synthesized at pressures >18 GPa and temperatures >2,200 K by a direct solid-state phase transition of graphite-like (BN) 0.48 C 0.52. The reported Vickers and Knoop hardnesses were intermediate between diamond and c-BN, making the new phase the second hardest known material. [39]
Diamonds sold through this process are known as conflict diamonds or blood diamonds. [129] In response to public concerns that their diamond purchases were contributing to war and human rights abuses in central and western Africa, the United Nations, the diamond industry and diamond-trading nations introduced the Kimberley Process in 2002. [140]
Cubic boron nitride is a strong contender (although it doesn't surpass diamond). According to its Wikipedia article: "Its hardness is inferior only to diamond, but its thermal and chemical stability is superior." Double sharp 12:19, 6 May 2014 (UTC) My tax man is far harder then any diamond; he can even squeezes blood out of a stone.--
Diamond is the ultimate abrasive, but graphite is soft and is a very good lubricant. Diamond is an excellent electrical insulator, but graphite is an excellent conductor. Diamond is an excellent thermal conductor, but some forms of graphite are used for thermal insulation (for example heat shields and firebreaks).
The best way to keep your rabbit safe without completely caging them in is to get an animal pen enclosure, like the kind some people use for puppy litters, Valand said.
Investors who follow the rig market can learn a very valuable lesson from the big earnings hit that Diamond Offshore had this past quarter: Know who a rig company's clients are. Both Diamond and ...
Outbreaks of the highly contagious stomach virus are more than double what they were last year, the Centers for Disease Control and Prevention says