SBA-15 is a mesoporous silicon-based molecular sieve with a highly ordered hexagonal straight pore structure (p6mm), the pore size can vary from 5 to 50 nm, and the pore wall is thicker.

The power conditions depend on the X-ray tube as the target material and focus type. Although Cu targets are widely used for diffraction, the use of Cu targets for residual austenite analysis is not recommended because of the strong fluorescence of iron-based materials.

Three-dimensional covalent organic frameworks, due to their structured nanochannels, open pore environment and good stability, have gained more and more attention

X-ray diffractometer (XRD) can be divided into X-ray powder diffractometer and X-ray single crystal diffractometer, the basic physical principle of the two is the same.