인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Perovskite chalcogenides have attracted significant interest due to their potential applications in optoelectronics, catalysis, and renewable energy systems. This paper examines the structural, electronic, elastic, and phononic properties of KMgX<sub>3</sub> (X = O, S, Se) using density functional theory (DFT) in the context of the full-potential linearized augmented plane wave plus local orbital (FP-LAPW + lo) approach. Their stability in the cubic phase (<i>Pm</i>3̄<i>m</i> symmetry) is confirmed by the computed lattice parameters for KMgO<sub>3</sub> (4.1325 Å), KMgS<sub>3</sub> (5.0008 Å), and KMgSe<sub>3</sub> (5.2070 Å). KMgO<sub>3</sub> exhibits semiconducting behavior with a direct bandgap of 7.323 eV in the spin-up state, according to electronic band structure studies, whereas KMgS<sub>3</sub> and KMgSe<sub>3</sub> show metallic properties. Elastic constants (C<sub>11</sub>, C<sub>12</sub>, and C<sub>44</sub>) meet the requirements for mechanical stability, which is evaluated using the Born criterion. Upon further examination of mechanical characteristics such as Bulk modulus, Shear modulus, Young's modulus, and Poisson's ratio. Materials such as KMgO<sub>3</sub> and KMgS<sub>3</sub> exhibit ductile behavior, whereas KMgSe<sub>3</sub> exhibits brittleness. Phonon dispersion curves and <i>ab initio</i> molecular dynamics simulations confirm the dynamical and thermal stability of these compounds. The results show that KMgX<sub>3</sub> perovskites have potential uses in optoelectronic devices and spintronics.
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