为认识合金的高温相变,采用热分析技术对Gd_5Si_(1.8)Ge_(1.8)Sn_(0.4)合金可能的高温相变进行了定性研究,并利用高温XRD研究了合金在200～400℃之间的相结构.研究结果表明:升温过程中,Gd_5Si_(1.8)Ge_(1.8)Sn_(0.4)合金在200-300℃之间发生了由Gd_5Si_2Ge_2-型单斜结构向Gd_5Si_4-型正交结构的转变.从而为探索材料方便快捷的制备工艺提供技术支持.
In order to understand high temperature phase transformation of alloys,the qualitative high temperature phase transformation of Gd_5Si_(1.8)Ge_(1.8)Sn_(0.4) alloy was investigated by thermal analysis,and the phase structure from 200℃to 400 ℃ was analyzed by Xray diffraction(XRD).The results showed that with the increase of temperature,the Gd_5Si_2Ge_2-type monoclinic structure transformed to the Gd_5Si_4-type orthorhombic structure in Gd_5Si_(1.8)Ge_(1.8)Sn_(0.4) alloy between 200 and 300℃,which would be helpful for exploring the convenient and rapid preparation technology.
参考文献
| [1] | Pecharsky VK;Gschneidner KA .Giant magnetocaloric effect in Gd-5(Si2Ge2)[J].Physical review letters,1997(23):4494-4497. |
| [2] | Pecharsky VK;Gschneidner KA .Tunable magnetic regenerator alloys with a giant magnetocaloric effect for magnetic refrigeration from similar to 20 to similar to 290 K[J].Applied physics letters,1997(24):3299-3301. |
| [3] | J.S. Meyers;S. Chumbley;F. Laabs .TEM analysis of Gd_5(Si_xGe_(1-x))4, where x=1/2[J].Acta materialia,2003(1):61-70. |
| [4] | Yurij Mozharivskyj;Alexandra O.Pecharsky;Vitalij K.Pecharsky;Gordon J.Miller .On the High-Temperature Phase Transition of Gd_5Si_2Ge_2[J].Journal of the American Chemical Society,2005(1):317-324. |
| [5] | PecharskyA O;Gschneidner Jr K A;Pecharsky V K .The giant magnetocaloric effect of optimally prepared Cd_5(Si_2Ge_2)[J].Journal of Applied Physics,2003,93(08):4722. |
| [6] | ZHANG Tiebang,CHEN Yungui,FU Hao,TENG Baohua,TANG Yongbai,TU Mingjing.The giant magnetocaloric effect in Gd5Si2Ge2 with low purity gadolinium[J].科学通报（英文版）,2005(16):1811-1814. |
| [7] | 张铁邦;陈云贵;唐永柏;任潼,杜会军,涂铭旌 .Gd_5Si_(1.8)Ge_(1 8)Sn_(0 4)合金中温度和磁场诱发的一级磁晶相变[J].北京科技大学学报,2006,28(z1):307. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%