Souemti, Lozano-Gorrín, Zayani, Essayes SA, Abbassi, Lalla, et al. Synthesis, Characterization and Electrical Properties of Both Pure and Cobalt-Doped Picromerite-Type Hydrated Double Salt K2Mg1−xCox(SO4)2·6H2O (x = 0, 0.4). Journal of Electronic Materials. 2016;45(8):4418-4424.