Surprisingly, the phase transition temperatures did not exhibit a clear trend based on different transition metals ( M =Mn, Co, Cu, Zn, and Cd), nor did they show a consistent pattern with varying methylene lengths of n =3, 4, 5, and 6.
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Exploring the potential applications of lead-free organic-inorganic perovskite type [NH<sub>3</sub>(CH<sub>2</sub>)<sub>n</sub>NH<sub>3</sub>]MCl<sub>4</sub> (n = 2, 3, 4, 5, and 6; M = Mn, Co, Cu, Zn, and Cd) crystals.
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