Cesium tungsten bronze for sunshade glass can be prepared by using ammonium tungstate ((NH4)10H2(W2O7)6, 99.99% purity) and cesium carbonate (Cs2CO3, 99.9% purity trace metal basis) as precursors.
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The experts dissolved these materials in distilled water, respectively, and stirred for 1 h at room temperature. And then, the two solutions were well mixed in a ceramic crucible. This mixture was dried at 180°C for 8 h in a heating chamber. The prepared powder was heated at 550°C for 1 h under a flowing H2/N2 gas mixture and annealed at 800°C for 1 h under a N2 gas flow in a vacuum furnace. Dark blue powders were obtained and analyzed via X-ray diffraction (XRD) at 1°/min between 0° and 90°. The powder was mixed with a dispersing agent (BYK2001) in ethanol, and a turbo-mill with an iron ball (20 mm) and zirconia bead (0.3 mm, ZrO2 94.5%, Y2O3 5.1%) was used for top-down stepwise grinding for 4 h.
