铁杂质对金红石晶胞参数的影响

对采自我国不同成因类型矿床及人工合成的金红石用X射线衍射法,在室温下进行了系统的晶胞参数测定。将其与化学分析及探针分析结果相对照,说明随着金红石中以类质同象置换形式存在的Fe~(3+)离子增加,晶胞参数也相应逐渐增大。 本工作对1号样品还进行了高温衍射测量,计算出金红石在不同温度下的晶胞参数及金红石晶胞参数随温度变化的线性方程。此外,还用激光热膨胀法测定了金红石的热膨胀系数,以资对照。

THE INFLUENCE OF IMPURITY IRON ON THE UNIT CELL PARAMETERS OF RUTILE

The parameters of rutile samples collected from different genetic types of ore deposits as well as of synthetic rutile samples were systematically measured by X-ray diffraction techniques under room temperature. The comparison of the results with the chemical and electron microprobe analyses indicate that the unit cell parameters of rutile tend to increase progressively with increasing Fe~(3+) in rutile, which is isomorphously substituted for Ti~(4+).High-temperature unit cell parameters of sample No. 1 were obtained by means of the high-temperature X-ray diffraction technique. The results indicate a linear relationship between unit cell parameter and temperature with correlation coefficient=0.999.For the purpose of comparison, the expansion coefficient of rutile was measured by laser thermal dilatomctry. The results indicate the anisotropism of rutile expansion.