Pulsed laser ablation of Ni in vacuum and atmosphere at various fluences. (July 2015)

• Record Type: Journal Article
• Authors: Bashir, Shazia; Khurshid, Shazaib; Akram, Mahreen; Ali, Nisar; , Umm-i-Kalsoom; Ahmad, Shahbaz; Yousaf, Daniel
• Is Part Of: Quantum electronics. Volume 45:Number 7(2015)
• Page Start: 640
• Page End: 647
• Publication Date: 2015-07
• Subjects: Quantum electronics -- Periodicals; 537.5
• DOI: 10.1070/QE2015v045n07ABEH015570
• Languages: English
• ISSNs: 1063-7818

Abstract

<abstract> <title>Abstract</title> <p>Mechanisms of Ni ablation in vacuum and <inline-formula id="i3"><tex-math><?CDATA ${\text{N}}_{2}$?></tex-math><inline-graphic xlink:href="ark:/27927/pgj2j5zj1qt" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> atmosphere at various fluences ranging from <inline-formula id="i4"><tex-math><?CDATA $2.1\ {\text{J cm}}^{-2}$?></tex-math><inline-graphic xlink:href="ark:/27927/pgj2j5zj1tg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> to <inline-formula id="i5"><tex-math><?CDATA $3.4\ {\text{J cm}}^{-2}$?></tex-math><inline-graphic xlink:href="ark:/27927/pgj2j5zj1sx" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> are studied by using a KrF excimer laser. The formation of various conical microstructures, ripples, large-sized irregular shaped cavities and pits is found. It is shown that no new phases are formed in the case of Ni ablation in vacuum, while new phases of nitrides and nitro-oxides appear in the <inline-formula id="i6"><tex-math><?CDATA ${\text{N}}_{2}$?></tex-math><inline-graphic xlink:href="ark:/27927/pgj2j5zj1c9" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> environment. The microhardness analysis of targets irradiated in vacuum shows a decreasing trend with increasing fluence, whereas in the case of the <inline-formula id="i7"><tex-math><?CDATA ${\text{N}}_{2}$?></tex-math><inline-graphic xlink:href="ark:/27927/pgj2j5zj1fd" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> environment, a monotonic increase in hardness with increasing fluence is observed.</p> </abstract>