Phase transformation and reaction kinetics of BaK122 precursor synthesized via a two-step method Xinyuan Liu, Xianping Zhang, Chiheng Dong, Minghui Tang, Dongliang Wang and Yanwei Ma Eur. Phys. J. B, 98 4 (2025) 80 Published online: 29 April 2025 DOI: 10.1140/epjb/s10051-025-00927-0