Second, for layer crystals the Grüneisen parameter along the plane may be negative for some temperatures because of vibration film effects, but for other crystals is positive always.

The mode properties of symmetric and non-symmetric one-dimensional photonic crystals with a sandwich layer defect were investigated by using the optical transmission matrix method.

The microstructure of the sample glaze layer under polarizing microscope and reflecting microscope has showed acicular hausmannite crystals on the glaze layer surface of luster glaze.