Dias Airton Natanael Coelho, Leopoldo Constantino Carlos José, Soares Cleber José, de Oliveira Sandro Guedes
Department of Physics, Chemistry, and Mathematics, UFSCar, 18052-780, Sorocaba, SP, Brazil.
Departament of Physics, FCT/UNESP, 19060-900, Presidente Prudente, SP, Brazil.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1884-1891. doi: 10.1166/jnn.2020.17172.
Raman analyzes were performed on zircon from a syenite located in the Poços de Caldas Complex, Brazil, with a fission-track (FT) zircon age of 81.4±6.8 Ma. Three isochronous heating (1, 10 and 100 hours) of zircon grains were subjected to temperatures between 300 and 750 °C. These temperature and times are usually applied to obtain zircon Fission-Track annealing dataset. For each time-temperature conditions, Raman spectra analyses were accomplished. The results show variations in the intensity and FWHM (full width at half maximum) in the main band (1007 cm- Si-O stretching mode), and a singular change in the peaks from 356 to 439 cm (Si-O bending mode); and from 202 to 224 cm (external modes). These changes were interpreted as spectral polarization-dependence related to common crystallinity increases due to the annealing radiation damages and that the thermal treatments do not interfere on the stability of zircon lattice.
对来自巴西波索斯卡尔达斯杂岩体中一个正长岩的锆石进行了拉曼分析，其裂变径迹（FT）锆石年龄为81.4±6.8百万年。对锆石颗粒进行了三次等时加热（1、10和100小时），温度在300至750°C之间。这些温度和时间通常用于获取锆石裂变径迹退火数据集。针对每个时间 - 温度条件，完成了拉曼光谱分析。结果表明，主峰（1007 cm - Si - O伸缩模式）的强度和半高宽（FWHM）存在变化，并且在356至439 cm（Si - O弯曲模式）以及202至224 cm（外部模式）处的峰有明显变化。这些变化被解释为与退火辐射损伤导致的常见结晶度增加相关的光谱偏振依赖性，并且热处理不会干扰锆石晶格的稳定性。
