CHEM 1B Chapter Notes - Chapter 13: X-Ray Crystallography, Phase Diagram, Coordination Number
Document Summary
Change in temp @ constant pressure = movement along horizontal line incr in temp = movement to the right along the line. Change in pressure represented by vertical line on the phase diagram. Drop in pressure = movement down the line approaching one of the curves. 13. 3 crystalline solids: determining their structure by x-ray crystallography go over this for. 13. 4 crystalline solids: unit cells and basic structures. Pattern reveals spacing b/w planes of atoms. X-ray crystallography allows us to determine regular arrangements of atoms within a crystalline solid -- crystalline lattice represent crystalline lattice w/ small collection of atoms, ions, etc. called unit cell. Coordination number - the number of atoms with which each atom is in direct contact closely related = packing efficiency, the percentage of volume of the unit cell occupied by the spheres (higher the cn, higher the pe) Hexagonal closest packing - third layer of atoms aligns exactly on top of the first (ababab)
