天然红宝石结构的原位漫反射中红外光谱研究

In Situ Diffuse Reflection Middle Infrared Spectroscopy Study of Natural Ruby Structure

利用原位漫反射中红外光谱研究天然红宝石的结构,发现红宝石结构的红外吸收模式主要包括:α-Al_(2)O_(3)分子中O^(2-)对静止Al^(3+)位移对应的红外吸收模式(ν_(α-Al_(2)O_(3)-O-Al))、Cr_(2)O_(3)分子中O^(2−)对静止Cr^(3+)位移对应的红外吸收模式(ν_(Cr_(2)O_(3)-O-Cr))、Fe_(2)O_(3)分子中O_(2)−对静止Fe3+位移对应的红外吸收模式(ν_(Fe_(2)O_(3)-O-Fe))、α-Al_(2)O_(3)分子中Al^(3+)之间位移对应的红外吸收模式(ν_(α-Al_(2)O_(3)-Al-Al))及锌尖晶石特征红外吸收模式(νZnAl_(2)O4);红宝石的主要结构包括:α-Al_(2)O_(3)、Cr_(2)O_(3)、Fe_(2)O_(3)及少量共生锌尖晶石。采用原位漫反射中红外光谱,研究小颗粒红宝石类矿物结构具有重要的应用价值。

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 O^(2-)ions inα-Al_(2)O_(3) molecules towards stationary Al^(3+)ions(ν_(α-Al_(2)O_(3)-O-Al)),the infrared absorption mode corresponding to the displacement of O_(2)−ions in Cr_(2)O_(3) molecules towards stationary Cr^(3+)ions(ν_(Cr_(2)O_(3)-O-Cr)),the infrared absorption mode corresponding to the displacement of O_(2)−ions in Fe_(2)O_(3) molecules towards stationary Fe^(3+)ions(ν_(Fe_(2)O_(3)-O-Fe)),and the infrared absorption mode corresponding to the displacement correspondence between Al^(3+)ions inα-Al_(2)O_(3) molecules(ν_(α-Al_(2)O_(3)-Al-Al))and characteristic infrared absorption mode of gahnite(ν_(ZnAl_(2)O4)).Ruby structure mainly includes:α-Al_(2)O_(3),Cr_(2)O_(3),Fe_(2)O_(3),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.