摘要
本文提出了一个无自由参数的晶体熔化温度随尺寸变化的模型．模型指出纳米金属晶体的熔化温度随着纳米晶的尺寸的减小而降低．当纳米尺寸达到其最小值时，熔化温度达到最低并伴随着熔化熵的消失．该模型对In，Pb纳米粒子和铁薄膜的熔化温度的理论预测与实验结果一致．在此基础上，预测了Fe。
A model without any adjustable parameters, describing the dependence of melting temperature on grain size, was established. It is demonstrated that melting temperature of metallic nanocrystals decreases as its size decreases. When the size of nanocrystals reaches its minimum, the melting temperature of the nanocrystals reaches its lowest value and the corresponding melting entropy is zero. With this model, the calculated melting temperatures of in and Pb nanocrystals and Fe thin film are in correspondence with the experimental results. The melting temperatures of magnetic recording nanocrystals of Fe, Co and Ni elements are predicted.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第8期870-874,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金!59671010
中国科学院金属研究所快速凝固非平衡合金国家重点实验室资助
关键词
磁记录纳米粒子
粒子半径
熔化熵
熔化温度
magnetic recording nanocrystal, radius of nanocrystal, melting entropy, melting temperature
