High resolution X-ray diffraction studies on unirradiated and irradiated strontium hexaferrite crystals

Bulletin of materials science

Balwinder Kaur²  K K Bamzai²  Ravi Kumar¹  F Licci³  Monita Bhat²  P N Kotru² 

[1] Nuclear Science Centre, New Delhi 110 067, India$$Nuclear Science Centre, New Delhi 110 067, IndiaNuclear Science Centre, New Delhi 110 067, India$$;Department of Physics and Electronics, University of Jammu, Jammu 180 006, India$$Department of Physics and Electronics, University of Jammu, Jammu 180 006, IndiaDepartment of Physics and Electronics, University of Jammu, Jammu 180 006, India$$;Instituto MASPEC â€�?? CNR, Via Chiavari 18/A, 43100 Parma, Italy$$Instituto MASPEC â€�?? CNR, Via Chiavari 18/A, 43100 Parma, ItalyInstituto MASPEC â€�?? CNR, Via Chiavari 18/A, 43100 Parma, Italy$$

关键词: Ion irradiation;    amorphization;    defects;    Sr-hexaferrite crystal;    X-ray diffraction;    topography.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

High-resolution X-ray diffraction technique, employing a three-crystal monochromatorâ€�?�collimator combination is used to study the irradiation induced defects in flux grown Sr-hexaferrite crystals irradiated with 50 MeV Li³⁺ ion beams at room temperature with a fluence value of 1 Ã�? 10¹⁴ ions/cm². The diffraction curves of the irradiated crystals suggest the possibility of creation of low angle grain boundaries and other point/clusters of defects causing amorphization in the irradiated crystals. The perfection of the irradiated and unirradiated (0001) cleaved surfaces of the crystals is studied using the bulk method of X-ray topography. The topographs supplement the findings suggestive of modifications in the crystalline quality of SrFe₁₂O₁₉ on irradiation with SHI of Li³⁺. Etching of the (0001) cleaved surfaces in H₃PO₄ at 120°C suggests that the dissolution characteristics of the surfaces get affected on irradiation with SHI of Li³⁺, besides supporting the findings of HRXRD and X-ray topography regarding modifications in the perfection of SrFe₁₂O₁₉ on irradiation.

【 授权许可】

Unknown