| 纳米晶体铁的低温热容和热稳定性 |
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| 引用本文： | 王岚,谭志诚,孟霜鹤,梁东白,高东升,孙志忠,刘振田. 纳米晶体铁的低温热容和热稳定性[J]. 材料研究学报, 2002, 16(1): 13-16 |
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| 作者姓名： | 王岚 谭志诚 孟霜鹤 梁东白 高东升 孙志忠 刘振田 |
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| 作者单位： | 1. 中国科学院大连化学物理研究所
2. 正元纳米材料有限公司 |
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| 摘 要： | 用等离子体法制备的纳米晶体铁由XRD和SEM等方法测定其晶粒尺寸的平均值为87nm，用绝热量热方法在79－371K温区精确测定了其低温热容，测量结果比大晶粒Fe的热容值有明显的增强，在80－300K温区之间增强热容为8％－14％，差示扫描量热（DSC）在温区的研究结果则表明，纳米晶体Fe在400－700K温区有一个宽的放热峰，对应于非平衡晶格缺陷所引起的焓释放，850K观察到一个放热峰，是纳米晶体铁从α相向α＋γ相转变所引起的。
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| 关 键 词： | 低温热容 纳米晶体铁 热稳定性 增强热容 相变 等离子体法 XRD SEM |
| 文章编号： | 1005-3093(2002)01-0013-04 |
| 修稿时间： | 2000-12-01 |
LOW TEMPERATURE HEAT CAPACITY AND THERMAL STABILITY OF NANOCRYSTALLINE IRON |
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| WANG Lan TAN Zhicheng MENG Shuanghe LIANG Dongbai. LOW TEMPERATURE HEAT CAPACITY AND THERMAL STABILITY OF NANOCRYSTALLINE IRON[J]. Chinese Journal of Materials Research, 2002, 16(1): 13-16 |
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| Authors: | WANG Lan TAN Zhicheng MENG Shuanghe LIANG Dongbai |
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| Abstract: | The sample of nanocrystalline iron with the average grain size of 87nm was prepared by thermal plasma technique, and characterized by XRD and SEM. Measurement of low temperature heat capacity of the nano-Fe has been performed in the temperature range of 79～371K with an automated adiabatic calorimeter. Enhanced heat capacities varying from 8% to 14% were observed.The differential scanning calorimetric measurement showed one broad exothermic regime from 400K to700K corresponding to the enthalpy releasing, due to the contribution of nonequibrium lattice defects.An endothermic peak at 850K due to a γ→α + γ phase transition of nc-Fe was observed. |
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| Keywords: | nanocrystalline iron heat capacity thermal stability enhanced heat capacity phase transition |
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