A Method for Orienting Forsterite Crystals Based on Polarized Laser Raman Spectroscopy
A technology of laser Raman spectroscopy and forsterite, applied in Raman scattering, material excitation analysis, material analysis through optical means, etc., can solve the problems of cumbersome testing of forsterite grain crystal axis orientation, etc., and achieve the test method Simplicity and the effect of improving collection efficiency
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Embodiment 1
[0070] (1) Prepare the sample to be tested: select the sample to be tested as a forsterite crystal growing up to about 1.5 cm, the z crystal axis direction can be determined by naked eye observation, and its top surface is ground into a plane along the direction perpendicular to the z crystal axis; therefore, it can be seen that The test plane is the (001) crystal plane.
[0071] (2) Obtaining Raman spectral information: Use polarized Raman spectroscopy to test it vertically, and test Raman spectra at intervals of 10° to obtain 36 spectral data; due to the distribution characteristics of crystal anisotropy, the data can be divided into four groups Spectra of similar characteristics, one of which sees figure 2 , and computes as well as a series of A g Vibration peak integral area ratio;
[0072] (3) Calculate the integral area ratio of Raman peaks: analyze and process the data, calculate 856cm -1 with 824cm -1 Raman peak integral area as a ratio See image 3 ;
[0073]...
Embodiment 2
[0077] (1) Prepare the sample to be tested: select a forsterite crystal sample with a growth of about 1.5 cm, the z crystal axis direction can be determined by naked eye observation, and a certain side surface is ground into a plane along the direction parallel to the z crystal axis;
[0078] (2) Obtaining Raman spectral information: Use polarized Raman spectroscopy to test it vertically, and test Raman spectra at intervals of 10° to obtain 36 spectral data; due to the distribution characteristics of crystal anisotropy, the data can be divided into four groups Spectra of similar characteristics, one of which sees Figure 4 ;
[0079] (3) Calculate the integral area ratio of Raman peaks: analyze and process the data, 856cm -1 with 824cm -1 The integral area of the Raman peak is used as the ratio R, see Figure 5 , and computes as well as a series of A g Vibration peak integral area ratio;
[0080] (4) Perform polar coordinate projection according to the value of the corr...
Embodiment 3
[0087] (1) Prepare the sample to be tested: select a forsterite sample in an ordinary rock slice;
[0088] (2) Obtaining Raman spectrum information: use polarized Raman spectrum to test it vertically, test the Raman spectrum every 10°, and obtain 36 spectral data. Its representative Raman spectrum is shown in Figure 7 ;
[0089] (3) Calculate the integral area ratio of Raman peaks: analyze and process the data, 856cm -1 with 824cm -1 The integral area of the Raman peak is used as the ratio R, see Figure 8 , and computes as well as a series of A g Vibration peak integral area ratio;
[0090] (4) Perform polar coordinate projection according to the value of the correlation coefficient R: take the rotation angle as the independent variable and the coefficient R as the dependent variable, set the polar coordinate system, then perform curve fitting on the point projection results, and calculate the length of the formed curve. The projection distances in the two directions...
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