Synthesis of amorphous Zirconium nitride films at different Ar/N2 ratios via the plasma sputter-type negative ion source - Aves, Ron Darell A.; Uy, Jenica Rozette Y.; Centeno, Aren Renz Y.; Ramos, Henry J. (Proceedings of the 33rd Samahang Pisika ng Pilipinas Physics Congress, 2015)