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Evidence of an ion-beam induced crystalline-to-crystalline phase transformation in hafnia

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  • A. Benyagoub

Abstract

Samples of monoclinic hafnia were irradiated with increasing fluences of 800 and 300 MeV Kr ions giving rise to a slowing down essentially caused by high electronic excitations. Their structural evolution was monitored in situ by the X-ray diffraction technique. The results indicate, for the first time to our knowledge, the occurrence in monoclinic hafnia of an ion-beam induced crystalline-to-crystalline phase transition. The new formed phase is very likely tetragonal and appears with an effective threshold in the deposited electronic energy loss which is around 20 keV nm -1 . In addition, the evolution of the amount of the produced phase with the ion fluence exhibits a sigmoidal shape suggesting a mechanism for phase transformation which needs two ion impacts. Some features of this phase transition are compared with those obtained in the case of zirconia, a well-known isomorphic material with hafnia. Copyright Springer-Verlag Berlin/Heidelberg 2003

Suggested Citation

  • A. Benyagoub, 2003. "Evidence of an ion-beam induced crystalline-to-crystalline phase transformation in hafnia," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 34(4), pages 395-398, August.
    • Handle: RePEc:spr:eurphb:v:34:y:2003:i:4:p:395-398
    DOI: 10.1140/epjb/e2003-00236-x
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