RT dataset T1 UBU-Polymers Research Group 12122025 A1 Urbaneja Miguel, Álvaro A1 Torija López, Alba A1 Carrancho Alonso, Ángel A1 Iriarte Avilés, Eneko A1 González Moreno, Sara A1 González Martín, José Manuel A1 Trigo López, Miriam A1 Vallejos Calzada, Saúl K1 Iron-oxide phase equilibria K1 Redox-controlled thermal processing K1 Process–structure–property relationship K1 Magnetite–hematite transformation K1 Atmosphere-controlled heat treatment K1 Functional optical materials K1 Ciencia de materiales K1 Materials science K1 Mineralogía K1 Mineralogy AB The dataset contains all raw data of the work "Atmosphere-controlled thermal processing enables tunable optical properties via iron-oxide phase engineering in natural silicate materials" PB Universidad de Burgos YR 2026 FD 2026-07-31 LK https://hdl.handle.net/10259/12054 UL https://hdl.handle.net/10259/12054 LA eng NO Urbaneja Miguel, Á., Torija López, A., Carrancho, Á., Iriarte, E., Gonzalez Moreno, S., Gonzalez Martin, J. M., Trigo López, M., & Vallejos, S. (2026). UBU-Polymers Research Group 12122025 [Dataset]. Universidad de Burgos. https://doi.org/10.71486/EDV4-8Z91 NO We gratefully acknowledge the financial support provided by all funders. Authors S. Vallejos and Á. Carrancho received Grant PID2023-147301OB-I00 and Grant PID2024-159094NB-I00, respectively, funded by MICIU/AEI/10.13039/501100011033 and FEDER. The financial support provided by Fondo Europeo de Desarrollo Regional-European Regional Development Fund (FEDER, ERDF) and Regional Government of Castilla y León -Consejería de Educación, Junta de Castilla y León- (BU025P23 and BU037P23) is gratefully acknowledged. This work was supported by the Regional Government of Castilla y León (Junta de Castilla y León) and by the Ministry of Science and Innovation MICIN and the European Union NextGenerationEU PRTR. Author Saul Vallejos received grant BG22/00086 funded by Spanish Ministerio de Universidades. DS Repositorio Institucional de la Universidad de Burgos RD 10-sep-2026