If the deviation occurs due to missing atoms, displaced atoms or extra atoms, the imperfection is named as
Schottky defect
Point defect
Frenkel defect
Metal excess defect
Which of the following has its atoms connected by valence bonds?
sodium chloride
diamond
graphite
none of these
How many carbon atoms surrounded each carbon atom in diamond structure?
8
2
4
6
Which of the following has 1.54 Ao bond length throughout the crystal?
silicon carbide
At what temperature diamond can be vapourized?
1000o C
4000oC
7000oC
400oC
Which of the following is extremely hard?
coal
coke
plastic
Which covalent network crystal is an exception in electrical conductivity?
W.L.Bragg and Wt Bragg derived a mathematical relation to determine interatomic distances from _____________ patterns.
X-ray diffraction
Wave length
Interatomic distance
Crystal diffraction
____________ defect arise when an ions occupies an interestitial position between the lattice points.
At what temperature the vibrational energy of the contents of the diamond increase?
6000oC
5000oC
