New Sn3Mo2O8 Compound: Synthesis and structural transitions

https://doi.org/10.1016/j.ceramint.2025.06.356

―A new Sn₃Mo₂O₈ compound was synthesized and its crystal structure was determined. A Sn₃Mo₂O₈/Bi₂₆Mo₁₀O₆₉ (89 %/11 %) composite was obtained by the solid-state synthesis. Vibrational modes of octahedra and temperatures of softening and disappearance of some modes from the IR absorption spectra in the temperature range of 80–500 K and the frequency range of 350–7000 cm⁻¹ was found. A correlation was established between the temperatures of the thermopower maxima and softening of IR modes, and anomalous in the temperature coefficient of resistance, impedance, which was explained within the displacement-type phase transition model. The activation energy and temperature range of the ionic conductivity in the Sn₃Mo₂O₈ compound was determined.