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- 1. Multiple Choice
Classification of imperfections can be describe as below except
Point defect
Line defect
Planar defect
Bulk defect
Uniform defect
- 2. Multiple Choice
Point defect are localized disruption in otherwise perfect atomic or ionic arrangements in a crystal structure. These imperfection was introduced by movement of atoms when they gain energy by all causes below EXCEPT?
Doping
Heating
Cooling
Introduction of impurites
- 3. Multiple Choice
What defect is this?
interstitial
vacancy
substitution
frenkel defect
- 4. Multiple Choice
This figure show what kind of defects?
Point defect
Line defects
Bulk defect
- 5. Multiple Choice
This defects can be observed by. You can answer more than 1.
Transmission Electron Micoscope
Scanning electron microscope
Xray diffraction
Atomic Force Microscope
UV Visible Spectrophotometer
- 6. Multiple Choice
Schottky defect is......
occur when two oppositely charged ions are missing from an ionic crystal and a cation-anion are created
occur when a positive cation move into an interstitial site in an ionic crystal and the vacancy-interstitialcy pair is created
- 7. Multiple Choice
Determine the factors that influence the diffusivity level?
pressure
temperature
type of crystal structure
concentration
volume
- 8. Multiple Choice
Calculate the energy formation, Qv of a vacancy in copper at 980 degree Celsius, where the equilibrium number of vacancies is 2.1 x 10^25 vacancies per cubic meter. The atomic mass and density for copper at this temperature are 62.8 g/mol and 7.9 g/cm^3, respectively. Given kB = 8.62 x 10^-5 eV/K and Avogadro No, NA= 6.02 x 10^23 atoms/mol.
0.780 eV
0.885 eV
0.123 eV
0.655 eV
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