Exam Questions Flashcards
WHat is the coordination number and cation-anion radius ratio of a linear geometry?
- 2
- <0.155
WHat is the coordination number and cation-anion radius ratio of a planar equilateral triangle geometry?
- 3
- 0.155-0.225
WHat is the coordination number and cation-anion radius ratio of a tetrahedron geometry?
- 4
- 0.225-0.414
WHat is the coordination number and cation-anion radius ratio of a octahedron geometry?
- 6
- 0.414-0.732
WHat is the cation-anion radius ratio when the coordination number is 8?
0.732-1.0
What is the structure type of rock salt?
AX
What is the structure type of cesium chloride?
AX
What is the structure type of zinc blende?
AX
What is the structure type of flourite?
AX2
What is the structure type of perovskite?
ABX3
What is the structure type of spinel?
AB2X4
What is the anion packing factor for rock salt?
FCC
What is the anion packing factor for cesium chloride?
simple cubic
What is the anion packing factor for zinc blende?
FCC
What is the anion packing factor for flourite?
simple cubic
What is the anion packing factor for perovskite?
FCC
What is the anion packing factor for spinel?
FCC
What is a Frenkel defect?
Cation leaves its normal place and moves into an interstitial site
What is a schottky defect?
The removal of one cation and one anion to an external surface
What are the 2 characterisitics of component ions that determine the crystal structure?
- magnitude of charge on each ion
- relative radius of cation/anion
How many octahedral and tetrahedral positions exist on anion spheres?
- 1 octahedral on each anion
- 2 tetrahedral on each anion
