高浓度Co掺杂ZnO晶体的水热法制备及磁性

采用水热法以CoO、ZnO混合为前驱物制备了ZnO晶体,矿化剂为6 mol/L KOH,填充度70;,温度430℃,两种样品CoO、ZnO组分物质的量百分比分别为0.5∶1和1∶1.当前驱物为nCo∶nZn=0.5∶1时,合成出Zn1-xCoxO晶体,Co元素掺杂量分别为6.83 at;和9.30 at;.当前驱物中nCo∶nZn=1∶1时,Zn1-xCoxO晶体中Co掺杂比例达到9.31 at;,同时伴有Co3O4生成,其中Zn掺杂比例达到14.59 at;,SEM显示,所制备的Zn1-xCoxO具有明显的ZnO晶体特征,形态完整,最大尺度约为50 μm.SQUID测量显示,生成物中Zn1-xCoxO晶体具有顺磁性,Zn1-xCoxO和Co3-xZnxO混合晶体也显示为顺磁性.

Magnetism of Co-doped ZnO Crystals with High Concentration Synthesized by Hydrothermal Method

Using CoO and ZnO mixtureas precursor,ZnO crystals were synthesized by hydrothermal method,6 mol/L KOH as mineralizer,with 70% fill factor,under the reaction temperature of 430 ℃,the molar ratio of two components of the sample was 0.5∶ 1 and 1∶ 1 respectively.When nCo∶ nZn was 0.5∶ 1,Zn1-xCoxO was synthesized.Co-doped elements share was 6.83at% and 9.30at%.When nCo∶ nZn was 1∶ 1,the doping ratio of Co in the Zn1-xCoxO crystal reached 9.31at%;the accompanying generation of Co3O4,and with Zn in Co3O4 doping ratio was 14.59 at%.SEM showed that the Zn1-xCoxO crystal with obvious characteristics of ZnO crystal had integrity morphology and the largest size of 50 μm.The SQUID measurements showed that Zn1-xCoxO crystal exhibited paramagnetic,as well as the mixture of Zn1-xCoxO and Co3-xZnxO.