Method for detecting A<n>B<x>C<1-x> element ratio of multi-element material

Abstract

The invention provides a method for detecting an A<n>B<x>C<1-x> element ratio of a multi-element material. The method comprises the following steps: acquiring a relation curve between the frequency of an A<n>B<x>C<1-x> coherent phonon of a to-be-detected multi-element material and x; detecting the energy band gap width Eg of the to-be-detected multi-element material A<n>B<x>C<1-x>; enabling a beam of ultrafast pump light higher than Eg to be vertical to the surface of the to-be-measured multi-element material for incidence; and emitting the probe light on the surface of the to-be-detected multi-element material at an angle theta to intersect with the pumping light at one point, changing the delay time between the probe light and the pump light to obtain a change curve of the interference intensity of the to-be-detected multi-element material along with time, and fitting the oscillation part to obtain a curve graph of the frequency of coherent phonons along with the change of energy flux density, wherein the frequency value of the coherent phonons under the energy flux density of any point is compared with the relation curve in the step S1 for analysis, and an x value is obtained. According to the technical scheme, operation is easy, and sensitivity is high.

Description

technical field [0001] The invention belongs to the technical field of element ratio detection, in particular to a multi-element material A n B x C 1-x The detection method of element ratio. Background technique [0002] In the past 20 years, people's understanding of thermoelectric materials has made great progress. Thermoelectric materials can be incorporated into power generation devices capable of converting waste heat into useful electrical energy, and thermoelectric materials can also be used for cooling applications in solid-state refrigeration devices. Thermoelectric materials that convert waste heat into electricity will play a role in the energy alternatives we are currently facing to reduce our dependence on fossil fuels and reduce greenhouse gas emissions. At present, magnesium-based thermoelectric materials are widely used, and its molecular structure is Mg 2 Si x sn 1-x . Although the application of magnesium-based thermoelectric materials is very wide,...

AI Technical Summary

Problems solved by technology

[0006] (1) The limitation of the XRD method is that the operation is complicated and it is difficult to detect the trace phase in the mixture;

[0007] (2) The limitation of the XPS method is that this method can only be used for surface analysis of samples, and the detected sample information is greatly affected by the detection depth

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