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The effect of the implantation and annealing conditions on the distribution of the implanted ions, as well as the size, static disorder, and stability of the grown GaN nanocrystals, is studied by means of transmission electron microscopy, Rutherford backscattering spectrometry, Raman scattering, and extended X-ray absorption fine structure spectroscopies. It is found that the optimum temperature range for the post-implantation annealing of the nanocrystals, with a size that ranges from about 3 to 12\u2009nm, is 1000\u20131100\u2009\u00b0C. Higher temperatures result in the dissociation of the nanocrystals and out-diffusion of N and Ga, whereas lower temperatures are insufficient for the growth of GaN nanocrystals. Annealing for 30\u201390\u2009s is optimum in order to avoid considerable loss of N and Ga. However, upon annealing at higher temperatures within the optimum range, up to 1100\u2009\u00b0C, or for longer times, up to 120 s, larger GaN nanocrystals are grown and\/or lower static disorder is observed.<\/jats:p>","DOI":"10.1063\/1.5132604","type":"journal-article","created":{"date-parts":[[2020,1,17]],"date-time":"2020-01-17T18:22:10Z","timestamp":1579285330000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Size control of GaN nanocrystals formed by ion implantation in thermally grown silicon dioxide"],"prefix":"10.1063","volume":"127","author":[{"given":"K.","family":"Filintoglou","sequence":"first","affiliation":[{"name":"School of Physics, Aristotle University of Thessaloniki 1 , 54124 Thessaloniki, Greece"}]},{"given":"F.","family":"Pinakidou","sequence":"additional","affiliation":[{"name":"School of Physics, Aristotle University of Thessaloniki 1 , 54124 Thessaloniki, Greece"}]},{"given":"J.","family":"Arvanitidis","sequence":"additional","affiliation":[{"name":"School of Physics, Aristotle University of Thessaloniki 1 , 54124 Thessaloniki, Greece"}]},{"given":"D.","family":"Christofilos","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Laboratory of Physics, Faculty of Engineering, Aristotle University of Thessaloniki 2 , 54124 Thessaloniki, Greece"}]},{"given":"E. 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