Structural Phase Transition and Magnetic Properties in Mn2-xCuxSnS4 (x = 0, 0.05, 0.1, 0.6, 0.7): From Defect Rock Salt to Disordered Spinel P Agasti, N Ramakrishna, A Mishra, S. N. Sarangi, S. L. Samal, European Journal of Inorganic Chemistry, e70227(2026)