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ELECTRON DIFFRACTION AND HIGH RESOLUTION MICRO-SCOPY STUDY ON INCOMMENSURATE MODULATED STRUCTURE IN Ce1+εFe4B4 ALLOY

LIN ZHEN-JIN LI FANG-HUA YANG DA-YU TIAN LING-HUA LI LONG

ELECTRON DIFFRACTION AND HIGH RESOLUTION MICRO-SCOPY STUDY ON INCOMMENSURATE MODULATED STRUCTURE IN Ce1+εFe4B4 ALLOY

LIN ZHEN-JIN, LI FANG-HUA, YANG DA-YU, TIAN LING-HUA, LI LONG
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  • Received Date:  26 May 1989
  • Published Online:  17 June 2005

ELECTRON DIFFRACTION AND HIGH RESOLUTION MICRO-SCOPY STUDY ON INCOMMENSURATE MODULATED STRUCTURE IN Ce1+εFe4B4 ALLOY

  • 1. (1)北京师范大学物理系,北京,100875; (2)中国高等科学技术中心(世界实验室); (3)中国科学院物理研究所,北京,100080; (4)中国科学院物理研究所,北京,100080,银川市宁夏大学物理系

Abstract: The permanent magnetic alloy Ce1+εFe4B4(ε= 0.1, B-rich phase) is studied by means of electron diffraction and high resolution electron microscopy. It has been determined that the Ce1+εFe4B4 alloy has a one-dimensional incommensurate modulated structure of Chimney-Ladder type consisting of two overlapped substructures fomed by Ce atoms and Fe-B clusters respectively. The unit cell parameters of Ce substructure are a = 7.08?, cCe= 3.51-3.60?, and the possible space groups are I4,I4,I4mm, I4/m, I4/mmm. The unit cell parameters of Fe-B substructure are a = 7.08?, cFe= 3.91?, and the space group is P/42/mcm. All of the major and satellite diffraction spots are indexed by using of four indexes method. The high resolution electron microscopic image shows contrast modulation bands corresponding to the modulated structure. The fluctuation of the period of Ce substructure has been observed and discussed. The orientational anormaly caused by the possible deviation of Ce atomic planes from the (a, b) plane is also discused.

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