Mn、Cu共掺ZnO磁性的研究

本文采用水热法,分别以ZnO、Zn(OH)2为前驱物,添加一定量的MnCl4.4H2O和CuSO4.2H2O, 3mol/LKOH作矿化剂,温度430℃,填充度35%,反应24h,制备了Mn、Cu共掺ZnO晶体。当前驱物为Zn(OH)2时,所得晶体大部分为短柱状晶体,显露正负极面{0001}、{0001-}、负锥面-p{101-1-}和柱面m{1-010},长度约为30 ～50μm。少部分晶体为单锥六棱柱状,显露正锥面p{101-1},柱面m{1-010},负极面-c{0001-},晶体的长度约为100μm,长径比为5:1。当ZnO用作前驱物时,短柱状晶体长度大约为10 ～30μm,晶体的六棱对称性都出现较大的偏差。X射线荧光能谱分析表明,前驱物为ZnO、Zn(OH)2时,Mn离子含量在分别为3.19%和1.62%原子分数,没有检测到Cu离子。虽然Mn、Cu离子的掺入会明显影响晶体形态,磁性测量显示掺杂Mn、Cu的ZnO仍为反铁磁。

Magnetic Properties of Mn, Cu Co-doped ZnO Crystals

In this paper, Mn, Cu co-doped ZnO crystals were synthesized by hydrothermal method with 3mol/L-1KOH as mineralizer, the fill factor of 35%, reaction temperature of 430℃, and time of 24h.When the Zn(OH)2 mixed with Mn, Cu were used as precursor, the shape of the most crystals was column. The positive polar +c{0001}, negative polar -c{000(1-)}, negative pyramidal face -p{ 10(1-)(1-)},and column face m { (1-)010 } were exposed. The length of the column crystals was 30-50μm. Some of the crystals shape were hexagonal cone. The negative polar -c{000(1-)}, positive pyramidal face +p{10(1-)1},and column face m{(1-)010} were exposed. The length of the hexagonal cone crystals was 100μm. And the length to the diameter was 5:1. When the ZnO mixed with Mn, Cu were used as precursor, the length of the column crystals was 10-30μm. The hexagonal shape of all the crystals became asymmetry. The concentration of Mn2+ in ZnO was 3.19at% ,1.62at%, respectively,when the precursor was ZnO and Zn (OH) 2 by the EDX. But the Cu ions were not found. Although the morphology of the crystals was affected by Mn, Cu doped, antiferromagnet was observed by the SQUID.