Lattices Structures in Crystalline Solids (10.6) Flashcards
- Describe the arrangement of atoms and ions in crystalline structures. - Compute ionic radii using unit cell dimensions. - Explain the use of X-ray diffraction measurements in determining crystalline structures.
What is a unit cell?
A unit cell contains a specific amount of atoms that make up the single cell. Unit cell sizes vary from how many atoms make up the unit cell.
Define simple cubic structure? (SC)
The atoms that occupy this space only fill about 52% of the unit cell.
What is a coordination number in a unit cell?
Tells you how many atoms are ions are directly touching or surrounding a particular atom or ion. Every atom is surrounded by other atoms.
How many atoms are in a simple cubic structure?
1 atom, by volume it is 52% least efficient use of space, C = 6 (6 atoms surround 1 atom)
How many atoms are in body centered cubic structure?
2 atoms, by volume it is 68% somewhat efficient use of space, C = 8 (8 atoms surround one atom).
How many atoms are in face centered centered cubic structure?
4 atoms, 74% by volume it is the most efficient out of all the three cubes, C = 12 (12 atoms surround 1 atom).
Define isomorphous structures?
Elements or compounds that crystallize with the same structures but different chemical compositions.
