Activation volumes for nanocrystal growth in amorphous Nd3.6Pr5.4Fe83Co3B5 at different temperatures

Activation volumes for nanocrystal growth in amorphous Nd3.6Pr5.4Fe83Co3B5 at different temperatures
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不同温度下非晶态 Nd3.6Pr5.4Fe83Co3B5 纳米晶生长的活化体积

DOI:
10.1088/0022-3727/44/14/145001
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发表时间:
2011-04
期刊:
J. Phys. D: Appl. Phys.
影响因子:
--
通讯作者:
Xiangyi Zhang
Xiangyi Zhang
中科院分区:
其他
文献类型:
--
作者:
Lei Xu;Defeng Guo;Xiaohong Li;Lipeng Zhou;Fengqing Wang;Xiangyi Zhang

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为了了解非晶Nd3.6Pr5.4Fe83Co3B5的纳米晶化过程,通过测量不同温度下随压力变化的速率常数,直接确定了合金中纳米晶生长的激活体积。在T = 773 K时,α-(Fe,Co)相生长的激活体积为(0.50 ± 0.02)Ω,其中Ω为合金的平均原子体积;在T = 823 K时,α-(Fe,Co)相生长的激活体积略有增加,为(0.59 ± 0.03)Ω。在823 K时,(Nd,Pr)2Fe 14 B相生长的激活体积为(0.52 ± 0.02)Ω。讨论了温度对晶体生长激活体积的影响。
To understand the nanocrystallization process of amorphous Nd3.6Pr5.4Fe83Co3B5, activation volumes for the growth of nanocrystals in the alloy have been determined directly by measuring the rate constants varying with pressure at different temperatures. At T = 773 K, the activation volume for the growth of α-(Fe,Co) phase is determined to be (0.50 ± 0.02)Ω, where Ω is the mean atomic volume of the alloy, and it increases slightly to (0.59 ± 0.03)Ω at T = 823 K. The activation volume for the growth of (Nd,Pr)2Fe14B phase at T = 823 K is determined to be (0.52 ± 0.02)Ω. The effect of temperature on the activation volume for nanocrystal growth is discussed.
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