Filetype Power Point PPTX | Posted on 05 Sep 2022 | 4 years ago
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281x Filetype PPTX File size 0.35 MB Source: bowenstaff.bowen.edu.ng
• An ideal crystal is regarded as a perfect crystal which has the same unit
cell and contains the same Lattice Point (LP) throughout the crystals.
• Crystals always have a regular periodic arrangement of atoms. Any
deviation from this periodicity is known as defects or imperfections in
crystals.
• Definition: The deviation from the perfect periodicity of atomic arrays
in crystals is known as crystal defects.
• Any deviation from this makes it imperfect (defects)
• Classification of crystal Varies from one author to another
• Point defects are due to missing atoms, displaced atoms or extra
atoms and therefore, stoichiometric in nature, these includes;
• Vacancy defect
• Interstitial Defect
• Frenkel Defect
• Schottky Defect
• The diagram on the next slide shows the basic classification of that
suit our own purpose
• Vacancy defects
• Interstitial Defects
• Schottky Defect
• Frenkel Defect
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