若在i相混合物(重g1克)中加入标准物质S的粉末(重g_s克)时,可列出以下联立方程 式中I为衍射X线的积分强度,K为有关强度因子的乘积。解方程可求出暂设体积分量V。 因在以上方程中假设样品仅由i相及标准物质S所组成,所以对于暂设重量分量G也可写出:G_1+C_s=1。由V可求出G,又因; G_s=((g_s)/(g_s+g_1))×100％,即可求出i物相在混合物样品中的重量g_1。 When a powder of standard substance S (g g-g) is added to an i-phase mixture (g g), I represents the integrated intensity of the diffracted X-ray in the following simultaneous equations, K being the product of the intensity factors involved. Solve the equation can be obtained temporarily volume component V. Since it is assumed in the above equation that the sample consists of only the i-phase and the standard substance S, the provisional weight component G can also be written as follows: G_1 + C_s = 1. G can be obtained from V, G; G_s = ((g_s) / (g_s + g_1)) × 100%, to find the phase i in the mixture sample weight g_1.