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Sol-gel synthesis, structure and magnetic properties of Mn-doped ZnO diluted magnetic semiconductors
Yingjing JiangWei Wang Chengbin Jing Chunyue CaoJunhao Chu 《Materials Science and Engineering: B》2011,176(16):1301-1306
2.5, 5, 10 and 15% Mn-doped ZnO diluted magnetic semiconductors (DMSs) were prepared via an ethyl acetoacetate-aided sol-gel process. The 5% Mn-doped ZnO consists of 20-50 nm spheroid-like particles and has a wurtzite phase. Existence of nanoscale ZnMnO3 clusters in this sample is confirmed by HRTEM analysis. Vegard's law calculation reveals that about 2.6% Mn atoms have been incorporated into ZnO lattice. Besides major wurtzite phase, ZnMnO3 secondary phase is observed in the 10% and 15% Mn-doped samples. The Mn-doped ZnO shows red shift of photoluminescence (PL), which arises from defects caused by Mn incorporation. The magnetic measurements confirm that the 2.5% and 5% Mn-doped ZnO samples display room-temperature ferromagnetism as well as paramagnetism, while the 10% and 15% samples exhibit paramagnetic effects. The as-observed ferromagnetic behaviors likely originate from cooperative effect of intrinsic and extrinsic magnetisms. 相似文献
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随着三峡水利枢纽工程的竣工,未来工程管理区在保留一小部分管理和服务配套功能的基础上,还将更多地承担旅游接待、文化展示、休闲娱乐和会议培训等功能,而原有建筑功能及系统已经不能满足坝区发展的需要。应充分利用现有的自然及人文资源,通过各类规划手段,如城市设计与风貌更新、旅游体系规划和景观系统规划等,提升坝区的职能,使整个坝区在功能上实现有机复合,在后建坝时期更好地适应周边区域的发展需要。 相似文献
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A yttria stabilized zirconia (YSZ) layer (∼2 μm) is fabricated by pulsed laser deposition (PLD) technique on an Ce0.8Sm0.2O2−δ (SDC) electrolyte film which is prepared by a co-pressing process on a NiO-SDC anode substrate. La0.8Sr02MnO3−δ-YSZ (LSM-YSZ, 70:30 wt.%) cathode is applied onto the SDC/YSZ bilayer electrolytes to form a single cell. The open circuit voltages of the cell increase significantly compared with that of the SDC single electrolyte cell. Preparation of an SDC buffer layer (∼500 nm) on the bilayer electrolytes by PLD method is also studied for reducing the cathode polarization losses with a Sm0.5Sr0.5CoO3−δ-SDC (SSC-SDC, 70:30 wt.%) cathode and preventing the interfacial chemical reaction between YSZ and SSC. The YSZ thin film blocks electrical current leakage in the SDC layer, whereas the SDC buffer layer with the SSC-SDC cathode decreases the cathode polarization losses, which results in the overall enhanced performance. 相似文献
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