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<p>This work investigates the thermal evolution, phase development, and structural consolidation of a Cu/Ce-acid-based geopolymer system (CCASP) subjected to controlled thermal treatments between 400 and 1000&#xa0;°C. Comprehensive TGA–HF analysis reveals four principal transformations in the raw CCASP: dehydration below 150&#xa0;°C, decomposition of crystalline NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> between 200 and 350&#xa0;°C, dehydroxylation of the aluminosilicate network at 500&#xa0;°C, and high-temperature condensation above 650&#xa0;°C. Progressive pre-heating (CCASP4, CCASP6, CCASP8, CCASP10) systematically reduces mass loss, suppresses endothermic–exothermic activity, and enhances thermal stability, reflecting decreasing hygroscopicity and increasing network cross-linking. XRD confirms the sequential formation of SAPO phases (SAPO-11, SAPO-35), Al(PO<sub>3</sub>)<sub>3</sub> metaphosphates, and ultimately a vitrified phosphate–aluminosilicate ceramic matrix at 1000&#xa0;°C. The combined thermal and structural findings demonstrate that CCASP systems evolve from a hydrated, NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub>-rich precursor into a highly consolidated glass–ceramic geopolymer, with CCASP8 and CCASP10 exhibiting exceptional stability and densification. The resulting materials retain a distinctive blue coloration, providing a unique combination of structural robustness and optical functionality, positioning Cu/Ce-based geopolymers as promising candidates for innovative architectural, catalytic, and optical ceramic applications.</p>

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Thermally Tunable Structure and Optical Properties of Cu2+/Ce3+ Co-Doped Acid-Based Geopolymers: Synthesis, Phase Evolution, and Luminescence Behavior

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Houda Ettoumi,
  • Ali Ben Ahmed,
  • Ahmed Hichem Hamzaoui,
  • Mohamed Toumi

摘要

This work investigates the thermal evolution, phase development, and structural consolidation of a Cu/Ce-acid-based geopolymer system (CCASP) subjected to controlled thermal treatments between 400 and 1000 °C. Comprehensive TGA–HF analysis reveals four principal transformations in the raw CCASP: dehydration below 150 °C, decomposition of crystalline NH4H2PO4 between 200 and 350 °C, dehydroxylation of the aluminosilicate network at 500 °C, and high-temperature condensation above 650 °C. Progressive pre-heating (CCASP4, CCASP6, CCASP8, CCASP10) systematically reduces mass loss, suppresses endothermic–exothermic activity, and enhances thermal stability, reflecting decreasing hygroscopicity and increasing network cross-linking. XRD confirms the sequential formation of SAPO phases (SAPO-11, SAPO-35), Al(PO3)3 metaphosphates, and ultimately a vitrified phosphate–aluminosilicate ceramic matrix at 1000 °C. The combined thermal and structural findings demonstrate that CCASP systems evolve from a hydrated, NH4H2PO4-rich precursor into a highly consolidated glass–ceramic geopolymer, with CCASP8 and CCASP10 exhibiting exceptional stability and densification. The resulting materials retain a distinctive blue coloration, providing a unique combination of structural robustness and optical functionality, positioning Cu/Ce-based geopolymers as promising candidates for innovative architectural, catalytic, and optical ceramic applications.