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15 Cards in this Set
- Front
- Back
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Crystalline solids Examples |
Those solids whose cons particles are arranged in a definite geometric pattern in 3d. NaCl, quartz |
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Long range order is possessed by (and what does it mean) |
Regular pattern(of particles) which repeats itself periodically (over the entire crystal). |
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Amorphous solids |
Solids whose constituent particles are NOT arranged in a regular arrangement. A-morpho= No form |
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Short range order |
In A solids, a regular pattern (of cons particles) is repeated over short distances only |
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Crystal lattice/space lattice |
Regular arrangement of cons particles (of a crystalline solid) in 3d space. |
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Unit cell |
A small 3d repeating portion of crystal lattice which when repeated over and over again(in 3d space) generates the entire crystal lattice. Types(on the basis of distribution of const particles) •primitive unit cell •centered/non-primitive " " |
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3 characteristics of crystal lattice |
• eacg point in a lattice is Ka lattice point. • lattice points rep constituent particles. • lattice points are joined using strght lines to bring out geometry of the crystal lattice. |
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Chara of unit cell |
•edge length a b c ( x b ee za re cy ) • angles (start from z and clockwise, assign alpha beta gamma) |
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Crystal defects |
Irregularities in arrangement (of const particles in a crystal). |
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Types of crystal defects |
• Point defects • Line defects |
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Point defects |
(arise due to) irregularities/deviation from ideal arrangement around points or atoms(in a crystal subs) |
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Line defects |
Irregularities/ deviation from ideal arrangement in entire rows of lattice points in a crystal. |
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Point defects types |
• Stoichiometric defects •Non stoichiometric defects •impurity defects |
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Stoichiometric defects definition |
Point defects that do NOT disturb the stoichiometry of the solid. |
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Stoichiometric defects are aka |
Intrinsic/ thermodynamic defects |
