本文選題：退火 + ZnO��； 參考：《人工晶體學報》2017年03期

【摘要】：采用水熱合成法實現(xiàn)了Co摻雜氧化鋅材料,并對所制備的材料以及在空氣中退火材料的電學和磁學性質(zhì)進行了研究。通過X射線衍射(XRD)、掃描電鏡(SEM)等方法對制得樣品的結(jié)構(gòu)、形貌進行了表征,結(jié)果表明:Zn_(0.9)Co_(0.1)O為六方纖鋅礦結(jié)構(gòu),鈷元素的摻入并不改變氧化鋅的物相結(jié)構(gòu)。由于摻雜過程中鈷元素替代晶格中鋅離子的位置,晶格常數(shù)發(fā)生了改變,同時也影響了材料的性質(zhì);退火后樣品的晶粒尺寸減小,結(jié)晶性變得更好。通過霍爾效應(yīng)測試系統(tǒng)對樣品的電輸運性質(zhì)和磁阻效應(yīng)進行了分析,結(jié)果表明初始樣品零場電阻大于退火后樣品。磁場對樣品內(nèi)的載流子濃度和遷移率產(chǎn)生了影響,從而影響樣品的電導率。兩組樣品均表現(xiàn)為正磁阻效應(yīng),這主要是由于電子局域化作用和能帶劈裂效應(yīng)共同作用的結(jié)果,初始樣品受到內(nèi)部晶格缺陷影響,磁阻效應(yīng)沒有持續(xù)增加,而經(jīng)退火處理后的樣品內(nèi)部晶格缺陷減少,水分子導電作用減弱,致使正磁阻作用越來越明顯。
[Abstract]:Co-doped zinc oxide materials were fabricated by hydrothermal synthesis. The electrical and magnetic properties of the prepared materials and annealed materials in air were studied. The structure and morphology of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the structure of the samples is hexagonal wurtzite, and the doping of cobalt does not change the phase structure of ZnO. Due to the substitution of cobalt for zinc ions in the lattice during doping, the lattice constants change and the properties of the materials are also affected. After annealing, the grain size of the samples decreases and the crystallinity becomes better. The electrical transport properties and magnetoresistive effect of the samples were analyzed by Hall effect test system. The results show that the zero field resistance of the initial sample is greater than that of the annealed sample. The magnetic field has an effect on the carrier concentration and mobility in the sample, thus affecting the conductivity of the sample. Both groups showed positive magnetoresistive effect, which was mainly due to the interaction of electron localization and band splitting effect. The initial sample was affected by internal lattice defects, but the magnetoresistive effect did not increase continuously. However, after annealing, the lattice defects in the samples are reduced, and the conductivity of water molecules is weakened, which results in more and more obvious positive magnetoresistive effect.
【作者單位】： 渤海大學新能源學院;
【基金】：國家自然科學基金(11404032,11404034) 遼寧省教育廳一般項目(LY2016002)
【分類號】：TQ132.41

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