1：Experimental Design and Method Selection:

The study used slip casting for green body formation and spark plasma sintering (SPS) for densification, with pre- and post-annealing treatments to remove carbon impurities and improve transparency. Viscosity measurements optimized slurry preparation.

2：Sample Selection and Data Sources:

Stoichiometric MgAl2O4 powder (Sp150) with specific particle size and purity was used. Samples were prepared via slip casting and subjected to annealing at various temperatures and times.

3：List of Experimental Equipment and Materials:

Equipment included a rotary viscometer (Model LVDVII; Brookfield), SPS system (SPS1050; SPS Syntex Inc.), FESEM (Mira 3-XMU), CHNS-O Elemental Analyzer (ECS 4010), SHIMADZU 8400S for IR transmission, and SHIMADZU UV-NIR Spectrophotometer (UV3100) for visible transmission. Materials included MgAl2O4 powder, deionized water, dispersant (Dolapix CE64), alumina balls, graphite die, carbon papers, and diamond pastes.

4：Experimental Procedures and Operational Workflow:

Slurry was prepared with optimized dispersant and milling time, slip cast into molds, dried, and annealed pre- or post-sintering. Sintering was done at 1400°C under vacuum and pressure. Samples were polished for optical measurements.

5：Data Analysis Methods:

Viscosity was measured with a viscometer, carbon content with CHNS analyzer, microstructure with FESEM, phase analysis with XRD, and optical transmission with spectrophotometers.