Ferrari, SergioDíaz Anichtchenko, DanielBotella, PabloIbañez, JordiOliva, RobertKuzmin, AlexeiMuñoz, AlfonsoAlabarse, FredericoErrandonea, Daniel2025-05-292025-05-292025Ferrari, S., Diaz-Anichtchenko, D., Botella, P., Ibáñez, J., Oliva, R., Kuzmin, A., Muñoz, A., Alabarse, F., & Errandonea, D. (2025). Pressure-induced decomposition of β-SnWO4. Results in Physics, 74, 108304. https://doi.org/10.1016/j.rinp.2025.1083042211-3797http://hdl.handle.net/11268/14683This study reports the decomposition of β-SnWO4 into Sn, SnO2, and WO3 induced by static compression. We performed high-pressure synchrotron powder angle-dispersive X-ray diffraction measurements and found that decomposition occurs at a pressure of 13.97(5) GPa and is irreversible. This result contradicts a previous study that, based on density-functional theory calculations and crystal-chemistry arguments, predicted a pressure- driven transition from β-SnWO4 to α-SnWO4. Our analysis indicates that the observed decomposition is unrelated to mechanical or dynamic instabilities. Instead, it likely stems from frustration of the β → α transition, as this transformation requires a change in Sn coordination from octahedral to tetrahedral.The assessment of how pressure influences the volume of the unit cell provided an accurate determination of the room-temperature pressure–volume equation of state for β-SnWO4. Furthermore, the elastic constants and moduli, as well as the pressure dependence of Raman and infrared modes of β-SnWO4, were derived from density-functional theory calculations. Several phonon modes exhibited softening, and three cases of phonon anti-crossing were observed.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal article10.1016/j.rinp.2025.108304open accessFísicaTermodinámicaTeoría cuánticaGoal 15: Sustainably manage forests, combat desertification, halt and reverse land degradation, halt biodiversity loss