The structure of natural Ruby was studied by In-situ diffuse reflectance middle infrared spectroscopy. The experiment found that the main infrared absorption modes of ruby include the infrared absorption mode corresponding to the displacement of O2- ions in α-Al2O3 molecules towards stationary Al3+ ions (να-Al2O3-O-Al), the infrared absorption mode corresponding to the displacement of O2- ions in Cr2O3 molecules towards stationary Cr3+ ions (νCr2O3-O-Cr), the infrared absorption mode corresponding to the displacement of O2- ions in Fe2O3 molecules towards stationary Fe3+ ions (νFe2O3-O-Fe), and the infrared absorption mode corresponding to the displacement correspondence between Al3+ ions in α-Al2O3 molecules (να-Al2O3-Al-Al) and characteristic infrared absorption mode of gahnite(νZnAl2O4). Ruby structure mainly includes: α-Al2O3, Cr2O3, Fe2O3, and a small amount of coexisting gahnite. In situ diffuse reflectance middle infrared spectroscopy is of great value in studying the structure of small Ruby like minerals.
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