CAJ | 학술논문

纳米铁酸锌广泛应用于催化和材料领域,为了避免传统焙烧法高耗能的缺点,本实验选用高效微波法制备纳米铁酸锌,并与常规焙烧进行对比,研究了铁酸锌晶粒生长动力学.采用FTIR、XRD和SEM对样品进行表征.结果表明,相同焙烧温度和焙烧时间下,微波法制备的铁酸锌比常规制备的样品结晶度高,颗粒大小更均匀.通过谢乐公式计算不同温度下铁酸锌粒径得出,焙烧温度低于 500℃时,焙烧方式对铁酸锌粒径影响较大;纳米铁酸锌晶粒生长动力学研究显示,微波焙烧时晶粒的平均生长指数为 9.66,低于常规焙烧生长指数(10.6),表明微波焙烧时晶粒的平均生长速率较高,有利于晶粒生长;同时,微波晶粒生长平均活化能为122.1kJ/mol,远低于常规焙烧平均活化能(179.4kJ/mol),说明微波可以降低晶粒生长活化能,且微波的"非热效应"影响晶粒的生长.
납미철산자엄범응용우최화화재료영역,위료피면전통배소법고모능적결점,본실험선용고효미파법제비납미철산자,병여상규배소진행대비,연구료철산자정립생장동역학.채용FTIR、XRD화SEM대양품진행표정.결과표명,상동배소온도화배소시간하,미파법제비적철산자비상규제비적양품결정도고,과립대소경균균.통과사악공식계산불동온도하철산자립경득출,배소온도저우 500℃시,배소방식대철산자립경영향교대;납미철산자정립생장동역학연구현시,미파배소시정립적평균생장지수위 9.66,저우상규배소생장지수(10.6),표명미파배소시정립적평균생장속솔교고,유리우정립생장;동시,미파정립생장평균활화능위122.1kJ/mol,원저우상규배소평균활화능(179.4kJ/mol),설명미파가이강저정립생장활화능,차미파적"비열효응"영향정립적생장.
The nano-grained zinc ferrite was prepared by high-efficiency microwave sintering,which eliminated the drawback of high energy consumption in traditional sintering. The grain growth kinetics of zinc ferrite by both microwave and traditional sintering were studied. The Fourier transforms infrared spectra,X-ray diffraction and scanning electron microscope were used to characterize the microstructure of the zinc ferrite. Our results showed that zinc ferrite samples obtained by microwave sintering were of better-crystallized phase and more homogeneous grain size distribution than those by the traditional sintering. The particle size of zinc ferrite was calculated by the Scherrer equation. Calcinations method has a significant impact on the grain size when the calcinations temperature is lower than 500℃. The kinetic studies of grain growth showed that the average exponent value of grain growth was 9.66 for the nano-grained zinc ferrite sintered by microwave,lower than that of the traditional sintered samples. It indicates that microwave can accelerate the reaction distinctively. The average activation energy of microwave and traditional sintered zinc ferriteare 122.1kJ/mol and 179.4 kJ/mol,respectively. It reveals that microwave can reduce activation energy of the grain growth and the non-thermal effect of microwave has an effect on the grain growth.