TY JOUR TI EFFECT OF NITROGEN CONCENTRATION IN MAGNETRON SPUTTERING ON STRUCTURE ALN-FILMS DEPOSITED ON SAPPHIRE SUBSTRATE KW aluminum nitride KW sapphire KW magnetron sputtering KW structure JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Narcev, V.. AU Zaycev, S.V. AU Prohorenkov, D.S. AU Evtushenko, E.I. AU Vaschilin, V.. PY 2016 IS 1 PB Belgorod State Technological University named after V.G. Shukhov