采用激光粒度分析仪、XRD、SEM等分析手段,测试研究了预烧温度对Ni Cu Zn铁氧体物相组织、烧结显微组织和直流偏置特性的影响。结果表明:当预烧温度较低时,固相反应不完全,致使铁氧体中残留Cu O,晶粒生长不均匀;提高预烧温度能够细化Ni ...采用激光粒度分析仪、XRD、SEM等分析手段,测试研究了预烧温度对Ni Cu Zn铁氧体物相组织、烧结显微组织和直流偏置特性的影响。结果表明:当预烧温度较低时,固相反应不完全,致使铁氧体中残留Cu O,晶粒生长不均匀;提高预烧温度能够细化Ni Cu Zn铁氧体的晶粒,并改善其直流偏置特性;当预烧温度在850℃时,能够获得较高的初始磁导率和较好的直流偏置特性。展开更多
The mechanical properties and the point defect energy of magnesium hydroxide（Mg（OH）2） were studied using the molecular dynamics. Moreover, the microelectronic structure of Mg（OH）2 with point defects in the bulk ...The mechanical properties and the point defect energy of magnesium hydroxide（Mg（OH）2） were studied using the molecular dynamics. Moreover, the microelectronic structure of Mg（OH）2 with point defects in the bulk and on its surface were investigated using the first principles. The simulation results indicate that Mg（OH）2 was easily modified by other cations because of its strong, favorable interstitial and substitution defects via point defect energy calculation. Mg（OH）2 can provide high-efficiency flame retardancy because of the strong OH（OH Schottky defect） or H bond（H Frenkel defect and Schottky defect）. The potential model of Mg（OH）2 was established, and molecular dynamics simulation was used to investigate the relations between the crystal structure and the mechanical properties. Mg（OH）2 with special morphology such as nano-sheets was a prior consideration to maintain the composite mechanical properties. The detailed electronic structures of Mg（OH）2 with defects were determined. This work may provide theoretical guidance for choosing dopant element and reveal the element doping mechanism of Mg（OH）2.展开更多
采用固相合成法制备了Ni Cu Zn铁氧体材料,对比研究了传统烧结与微波烧结工艺对Ni Cu Zn铁氧体材料的致密化行为、显微结构、磁滞回线和直流偏置特性的影响。结果表明,在微波烧结方式中,材料的致密化曲线向低温方向偏移,烧结致密度得到...采用固相合成法制备了Ni Cu Zn铁氧体材料,对比研究了传统烧结与微波烧结工艺对Ni Cu Zn铁氧体材料的致密化行为、显微结构、磁滞回线和直流偏置特性的影响。结果表明,在微波烧结方式中,材料的致密化曲线向低温方向偏移,烧结致密度得到提高,晶粒尺寸显著增大;对比于传统烧结,微波烧结材料的饱和磁感应强度从312m T提高至479m T,起始磁导率从65提升至170,但在叠加直流偏置电流为3A时,磁导率下降幅度从28.5%增至48.4%。展开更多
文摘采用激光粒度分析仪、XRD、SEM等分析手段,测试研究了预烧温度对Ni Cu Zn铁氧体物相组织、烧结显微组织和直流偏置特性的影响。结果表明:当预烧温度较低时,固相反应不完全,致使铁氧体中残留Cu O,晶粒生长不均匀;提高预烧温度能够细化Ni Cu Zn铁氧体的晶粒,并改善其直流偏置特性;当预烧温度在850℃时,能够获得较高的初始磁导率和较好的直流偏置特性。
基金Projects(5117413820971088)supported by the National Natural Science Foundation of China+1 种基金Project(JCYJ20130329102720840)supported by Shenzhen Government’s Plan of Science and TechnologyChina
文摘The mechanical properties and the point defect energy of magnesium hydroxide（Mg（OH）2） were studied using the molecular dynamics. Moreover, the microelectronic structure of Mg（OH）2 with point defects in the bulk and on its surface were investigated using the first principles. The simulation results indicate that Mg（OH）2 was easily modified by other cations because of its strong, favorable interstitial and substitution defects via point defect energy calculation. Mg（OH）2 can provide high-efficiency flame retardancy because of the strong OH（OH Schottky defect） or H bond（H Frenkel defect and Schottky defect）. The potential model of Mg（OH）2 was established, and molecular dynamics simulation was used to investigate the relations between the crystal structure and the mechanical properties. Mg（OH）2 with special morphology such as nano-sheets was a prior consideration to maintain the composite mechanical properties. The detailed electronic structures of Mg（OH）2 with defects were determined. This work may provide theoretical guidance for choosing dopant element and reveal the element doping mechanism of Mg（OH）2.
文摘采用固相合成法制备了Ni Cu Zn铁氧体材料,对比研究了传统烧结与微波烧结工艺对Ni Cu Zn铁氧体材料的致密化行为、显微结构、磁滞回线和直流偏置特性的影响。结果表明,在微波烧结方式中,材料的致密化曲线向低温方向偏移,烧结致密度得到提高,晶粒尺寸显著增大;对比于传统烧结,微波烧结材料的饱和磁感应强度从312m T提高至479m T,起始磁导率从65提升至170,但在叠加直流偏置电流为3A时,磁导率下降幅度从28.5%增至48.4%。
