论文部分内容阅读
本文对LiIO_3-NaIO_3赝二元系的相图,相变,非晶态的形成和稳定性,以及晶化的动力学过程等进行了仔细的研究,LiIO_3-NaIO_3赝二元系属共晶体系,共晶温度为325℃,共晶点成份为含50m/o LiIO_3,用共晶点附近成份的试样,在超过熔点150℃的情况下首次获得碘酸盐的非晶态,非晶态的存在降低了LiIO_3的表观相变温度,强X射线的辐照,各种空气湿度,细粒度等因素都加速非晶态的晶化速率,从二元系非晶态块中,LiIO_3晶化的速率与完整性都大于NaIO_3,当晶化量y=0.1—0.9时,等温晶化过程符合Johnson-MehI-Avrami方程式y(t)=1-exp(-bt~n),Avrami指数n=2—3,晶化速率常数b随温度指数增加,晶化激活能为2.21eV。
In this paper, the phase diagram, phase transition, the formation and stability of amorphous state, and the kinetics of crystallization have been carefully studied. The LiIO_3-NaIO_3 pseudo-binary system is a eutectic system , The eutectic temperature is 325 ℃, the eutectic composition is 50m / o LiIO_3, and the sample with the composition near the eutectic point is above the melting point of 150 ℃ for the first time to obtain the iodate amorphous, amorphous , The apparent phase transition temperature of LiIO_3 is reduced, and the strong X-ray irradiation, various air humidity and fine grain all accelerate the crystallization rate of amorphous. From the binary amorphous block, The rate of crystallization and the integrity are all greater than that of NaIO_3. When the amount of crystallization is y = 0.1-0.9, the isothermal crystallization process accords with Johnson-MehI-Avrami equation y (t) = 1 -exp (-bt ~ n) = 2-3, the crystallization rate constant b increases with temperature, the activation energy of crystallization is 2.21eV.