Patent ID: 7003074
Filing Date: 2006-02-21
Classification: G01N,H01L

Abstract:
1. A stress measurement method using X-ray diffraction, said method comprising: (a) preparing a c-axis-oriented specimen of a tetragonal polycrystal as a specimen to be measured; (b) defining, as a specimen coordinate system, a coordinate axis P (c) selecting one set of Miller indices (hkl) of the specimen, and arranging the X-ray source and the X-ray detector to be symmetrical about a normal to a crystal plane with said one set of Miller indices (hkl), the normal to the crystal plane being inclined from a normal to the specimen surface at an angle of ψ, so that a diffracted X-ray from the crystal plane with said one set of Miller indices (hkl) is detectable with a diffraction angle θ (d) irradiating the specimen with an X-ray, detecting a diffracted X-ray therefrom with the X-ray detector, adjusting the X-ray optical system to determine a diffraction angle θ at which the diffracted X-ray exhibits a maximum intensity, and determining the diffraction angle θ as a measurement value; (e) determining a strain based on the diffraction angle θ (f) repeating steps (c) to (e) in which another set of Miller indices (hkl) is selected in step (c), and determining a strain with respect to said another set of Miller indices (hkl); (g) arranging said coordinate axis L (h) repeating steps (c) to (f); (i) arranging said coordinate axis L (j) repeating steps (c) to (f); and (k) determining a stress σ