摘要
在热重分析系统上进行磁热重分析（ＭＴＧＡ），测量非晶ＦｅＳｉＢ合金升温过程的比饱 和磁化强度（σ）随温度变化σ－τ曲线及（ｄσ／ｄτ）－ｔ曲线，它比ＤＳＣ分析能更加明显的区分晶 化过程的各个阶段．结果表明．样品升温过程经历了６个阶段的变化；并且发现，在晶化温 度ｔ．以下约１５０℃温区内等温退火的样品．居里温度ｔ_ｅ随退火温度ｔ_ａ增大而升高，在４３０℃ 附近，ｔ_ｅ上升出拐点．（ｄσ／ｄｔ）－ｔ曲线的极小温度峰温ｔ_ｍ（它反映从铁磁性向顺磁性转变 最大速率的温度）随ｔ_ａ的变化与ｔ_ｅ相似。
The σ-t and dσ/dt - t curves of FeSiB amorphous alloy, relating apparent weight loss with temperature are investigated by magnetic thermogravimetry analysis (MTGA) technique. It is found that the crystallization process of the samples can he divided into six stages.The studies of samples annealed below the crystallization temperature t_x (about 150 ℃ ) for 0.5 h show that the Curie temperature (t_C) of residual amorphous phase also increases linearly with the annealing temperature (t_a) when t_a is increased, about 430 ℃, the line of t_c has a inflexion. The variation of the minimum temperature (t_m) of the (do/dt) - t curve with t_a is similar to that of the to with t_m expressing the temperature showing the fastest transition rate of the samples from ferromagnetic amorphous phase into paramagnetic one.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2000年第2期28-31,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
广东省重点攻关基金资助项目
