摘要
用爱因斯坦模型和德拜模型分析得出无磁场时铁、钴和镍磁性粒子热容量的变化,用统计物理方法分析了磁矩与外磁场相互作用、晶格振动、表面自由能等对铁、钴和镍纳米铁磁粒子热容量的影响.数值计算结果表明:无磁场时,低温情形下热容量随着温度的升高而变大,温度较高时趋于稳定;磁矩与外磁场相互作用引起的纳米铁磁粒子的热容量随温度的升高而增大,随外磁场强度的增大而减小;晶格振动引起的纳米铁磁粒子热容量随温度的升高而增大;粒子表面能引起的热容量随温度的升高而增大,粒径越大,热容量也越大.
With no external magnetic field, using Einstein model and Debye model and theory of statistical physics, the changes of heat capability of Fe, Co, Ni ferromagnetic nano - particles are discussed, as well as the effect of the interaction between magnetic moments and external magnetic field, lattice vibration and surface free energy on the heat capability of Fe, Co, Ni ferromagnetic nano - particles. The results of mathematical calculation show that, with no external magnetic field, the value of the heat capacity will increase with the higher temperature under low temperature, and the heat capacity stays unchanged under high temperature. Heat capacity of ferromagnetic nano - particles caused by interaction between magnetic moments and external magnetic field will increase with the higher temperature, and will decrease as the external magnetic field strength increases. Heat capacity of ferromagnetic nano - particles caused by lattice vibration will increases with the higher temperature. Heat capacity caused by surface free energy of the nano -particles will increase as the temperature gets higher and the larger the grain diameters are, the greater the thermal capacity is.
出处
《重庆文理学院学报（自然科学版）》
2010年第1期56-60,共5页
Journal of Chongqing University of Arts and Sciences
关键词
热力学性质
纳米铁磁粒子
热容量
thermodynamic properties
magnetic nano - particles
heat capacity
