lonsdaleite उदाहरण वाक्य

Under some conditions, carbon crystallizes as lonsdaleite, a hexagonal crystal lattice with all atoms covalently bonded and properties similar to those of diamond.
A quantitative analysis of the X-ray diffraction data of lonsdaleite has shown that about equal amounts of hexagonal and cubic stacking sequences are present.
Some typical diamonds contain inclusions of common polymorph, lonsdaleite, have been found as inclusions in carbonados, although such inclusions might be expected if carbonados formed by meteorite impact.
On the other hand, recent shock experiments with in situ X-ray diffraction show strong evidence for creation of relatively pure lonsdaleite in dynamic high-pressure environments such as meteor impacts.
The property of lonsdaleite as a discrete material has been questioned, since specimens under crystallographic inspection showed not a bulk hexagonal lattice, but instead cubic diamond dominated by structural defects that include hexagonal sequences.

One group examined carbon-14 dates for charcoal particles that showed wildfires occurred well after the proposed impact date, and the glass-like carbon was produced by wildfires and no lonsdaleite was found.
The wurtzite form of boron nitride ( w-BN; point group = C 6v; space group = P6 3 mc ) has the same structure as lonsdaleite, a rare hexagonal polymorph of carbon.
:I thought lonsdaleite occurs naturally and could in principle be harder than diamond ( except natural samples are never pure enough for that ) . talk ) 09 : 22, 8 May 2014 ( UTC)
I would try to be clear about structures and show how lonsdaleite can be seen as derived from the diamond structure ( but hexagonal ) and nanotubes can be seen as derived from the graphite stucture ( rolled sheet ).
I went to look this up, and according to Wikipedia, there's a whole nother kind of carbon called Lonsdaleite with a hexagonal matrix, which is harder than diamond in one plane but much softer in practice.