First-Principles Investigation of Structural and Thermoelectric Properties of KXH3 (X = Al, Mn, Ni) Perovskite HydridesNoureddine Elmeskini, Ayoub Koufi, Younes Ziat, Hamza Belkhanchi, Ayoub Fatihi, Charaf Laghlimi and Noureddine LakouariE3S Web Conf., 704 (2026) 01002DOI: https://doi.org/10.1051/e3sconf/202670401002