The Crystal and Synthetics under Cathode Luminescence Characteristic’s Research
|School||Chinese Geology University (Beijing)|
|Keywords||Cathodoluminescence Crystal and its synthetic products Luminescence centers|
This thesis is optional Crystal amethyst, topaz and rock crystal (211) cathodoluminescence BY-1 instrument as an object of study, the test sample luminous color, strength and internal structure characteristics. Comparative Analysis of the light-emitting characteristics of various colors crystal and its synthetic products, draw the cathodoluminescence law of the crystal. Test conditions: voltage 7-8kv, current 1500μA microscope magnification of 10 times. The colorless crystal cathodoluminescence weak to none, a few weak blue-violet. Weak - moderate red light emitting of the synthetic product, occasionally a blue light-emitting; cathode luminescence of the yellow crystals as a weak - moderate blue violet portion of the sample to a strong red-orange, synthetic yellow crystal as a weak - moderate orange-red light; the amethyst cathodoluminescence both blue-violet and red light, only the red light-emitting synthetic amethyst, amethyst luminous intensity higher than synthetics; topaz and amethyst are of color from shallow to deep, and its the cathodoluminescence intensity gradually increases, the in cathodoluminescence observe some of the characteristics of the crystal internal structure: fractured, the gas-liquid package body, ribbon, seed crystal plate. The combined Crystal Color Genesis theory and Cathodoluminescence explore Crystal the cathodoluminescence mechanism: colorless crystal of pure crystals of SiO2 and rarely contain structural defect and impurity ions, cathodoluminescence weak - no. Synthetic colorless crystal in the growth process to produce some structural defects luminescence center, or the impurities contained in the dopant ions will produce moderate - strong red light. Amethyst its color and composition of the synthetic products of FeO contained 4 4 - sup> hole color center, the cathodoluminescence red, amethyst also contains trace aluminum and blue-purple. Citrine presented containing Al3 O-violet light, containing Fe3 impurity ions was orange-red shade, topaz can be presented simultaneously two colors, orange red synthetic topaz. Amethyst, topaz, synthetics cathodoluminescence characteristics differences: the crystal its Color Genesis synthetics difference; different features of both the internal structure; synthetic crystal growth process defects; crystal and The products of the synthesis by the length of the irradiation time and intensity will cause its cathode luminescence characteristics of the difference. There are three aspects: sample aspects, the sample size, shape, thickness and color of the experimental results influence factors affecting the cathode luminescence of experimental results; instrument debugging aspects, the electron gun voltage and current of the regulator; internal structural characteristics of the observed aspects have a certain degree of difficulty .