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Kupchak I. M. Vibrational states of hexagonal ZnO doped with Co [Електронний ресурс] / I. M. Kupchak, N. F. Serpak, V. V. Strelchuk, D. V. Korbutyak // Semiconductor physics, quantum electronics & optoelectronics. - 2015. - Vol. 18, № 1. - С. 86-89. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2015_18_1_17 Vibrational density of states of 12,5 % cobalt doped bulk hexagonal ZnO has been studied using the density functional theory method. It has been shown that introduction of cobalt into ZnO leads to appearance of additional vibrational modes with their frequencies dependent on the relative positions of cobalt atoms. The magnetic and vibrational properties have been studied in highly Co-doped ZnO samples that are characterized by a high possibility of metal clusters formation.
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Kupchak I. Electronic and magnetic properties of spinel Co3O4 (111) surface in GGA + U approximation [Електронний ресурс] / I. Kupchak, N. Serpak // Ukrainian journal of physics. - 2017. - Vol. 62, № 7. - С. 615-624. - Режим доступу: http://nbuv.gov.ua/UJRN/Ukjourph_2017_62_7_11
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Kupchak I. M. Metal vacancies in Cd1-xZnxS quantum dots [Електронний ресурс] / I. M. Kupchak, D. V. Korbutyak, N. F. Serpak, A. Shkrebtii // Semiconductor physics, quantum electronics & optoelectronics. - 2020. - Vol. 23, № 1. - С. 66-70. - Режим доступу: http://nbuv.gov.ua/UJRN/MSMW_2020_23_1_11
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Kupchak I. M. Spectral characteristics of passivated CdTe quantum dots with coordinate-dependent parameters [Електронний ресурс] / I. M. Kupchak, D. V. Korbutyak // Ukrainian journal of physics. - 2023. - Vol. 68, № 1. - С. 38-46. - Режим доступу: http://nbuv.gov.ua/UJRN/Ukjourph_2023_68_1_7
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