...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of magnetism and magnetic materials >The effect of different temperature annealing on phase relation of LaFe_(11.5)Si_(1.5) and the magnetocaloric effects of La_(0.8)Ce_(0.2)Fe_(11.5-x)Co_xSi_(1.5) alloys
【24h】

The effect of different temperature annealing on phase relation of LaFe_(11.5)Si_(1.5) and the magnetocaloric effects of La_(0.8)Ce_(0.2)Fe_(11.5-x)Co_xSi_(1.5) alloys

机译：不同温度退火对LaFe_（11.5）Si_（1.5）相关系和La_（0.8）Ce_（0.2）Fe_（11.5-x）Co_xSi_（1.5）合金的磁热效应的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The phase relation of LaFeu.sSii.5 alloys annealed at different high-temperature from 1223 K (5 h) to 1673 K (0.5 h) has been studied. The powder X-ray diffraction (XRD) patterns show that large amount of 1:13 phase begins to form in the matrix alloy consisting of a-Fe and LaFeSi phases when the annealing temperature is 1423 K. In the temperature range from 1423 to 1523 K, a-Fe and LaFeSi phases rapidly decrease to form 1:13 phase, and LaFeSi phase is rarely observed in the XRD pattern of LaFe_(11.5)Si_(1.5) alloy annealed at 1523 K. With annealing temperature increasing from 1573 to 1673 K, the LaFeSi phase is detected again in the LaFe_(11.5)Si_(1.5) alloy, and there is La_5Si_3 phase when the annealing temperature reaches 1673 K. There almost is no change in the XRD patterns of LaFe_(11.5)Si_(1.5) alloys annealed at 1523 K for 3-5 h. According to this result, the La_(0.5)Ce_(0.2)Fe_(11.5-x)Co_xSi_(1.5) (0 < x < 0.7) alloys are annealed at 1523 K (3 h). The analysis of XRD patterns shows that Lao.sCeo^Fen.sxCOxSij.s alloys consist of the NaZn13-type main phase and a-Fe impurity phase. With the increase of Co content from x=0 to 0.7, the Curie temperature T_c increases from 180 to 266 K. Because the increase of Co content can weaken the itinerant electron metamagnetic transition, the order of the magnetic transition at Tc changes from first to second-order between x=0.3 and 0.5. Although the magnetic entropy change decreases from 34.9 to 6.8 J/kg K with increasing Co concentration at a low magnetic field of 0-2 T, the thermal and magnetic hysteresis loss reduces remarkably, which is very important for the magnetic refrigerant near room temperature.
机译：研究了在1223 K（5 h）到1673 K（0.5 h）不同高温下退火的LaFeu.sSii.5合金的相位关系。粉末X射线衍射（XRD）图谱表明，当退火温度为1423 K时，由α-Fe和LaFeSi相组成的基体合金中开始形成大量的1:13相。 K，a-Fe和LaFeSi相迅速下降形成1:13相，并且在1523 K退火的LaFe_（11.5）Si_（1.5）合金的XRD图谱中很少观察到LaFeSi相。随着退火温度从1573提高到1673 K，在LaFe_（11.5）Si_（1.5）合金中再次检测到LaFeSi相，当退火温度达到1673 K时存在La_5Si_3相。LaFe_（11.5）Si_（1.5）的XRD谱图几乎没有变化）合金在1523 K下退火3-5小时。根据此结果，将La_（0.5）Ce_（0.2）Fe_（11.5-x）Co_xSi_（1.5）（0

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号