Wang Meng, Wang Ting, Song Shenhua, Ravi Muchakayala, Liu Renchen, Ji Shishan
Shenzhen Key Laboratory of Advanced Materials, Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China.
Research Institute of Tsinghua University in Shenzhen, Shenzhen 518055, China.
Materials (Basel). 2017 Apr 28;10(5):474. doi: 10.3390/ma10050474.
Based on precursor powders with a size of 200-300 nm prepared by the low-temperature solid-state reaction method, phase-pure YMnO₃ ceramics are fabricated using spark plasma sintering (SPS). X-ray diffraction (XRD) and scanning electron microscopy (SEM) reveal that the high-purity YMnO₃ ceramics can be prepared by SPS at 1000 °C for 5 minutes with annealing at 800 °C for 2 h. The relative density of the sample is as high as 97%, which is much higher than those of the samples sintered by other methods. The present dielectric and magnetic properties are much better than those of the samples fabricated by conventional methods and SPS with ball-milling precursors, and the ferroelectric loops at room temperature can be detected. These findings indicate that the YMnO₃ ceramics prepared by the low temperature solid reaction method and SPS possess excellent dielectric lossy ferroelectric properties at room temperature, and magnetic properties at low temperature (10 K), making them suitable for potential multiferroic applications.
基于通过低温固相反应法制备的尺寸为200 - 300 nm的前驱体粉末，采用放电等离子烧结（SPS）制备了纯相YMnO₃陶瓷。X射线衍射（XRD）和扫描电子显微镜（SEM）表明，通过在1000 °C下进行5分钟的SPS烧结并在800 °C下退火2小时，可以制备出高纯度的YMnO₃陶瓷。样品的相对密度高达97%，远高于通过其他方法烧结的样品。目前的介电和磁性能比通过传统方法以及使用球磨前驱体制备的SPS样品要好得多，并且可以检测到室温下的铁电回线。这些发现表明，通过低温固相反应法和SPS制备的YMnO₃陶瓷在室温下具有优异的介电损耗铁电性能，在低温（10 K）下具有磁性能，使其适用于潜在的多铁性应用。
