Abstract
Na-doped γ-La2S3 powders with various Na/La ratios were synthesized by the gas–solid reaction method. Then they were sintered by hot pressing to study the effects of Na+ ions on the microstructures and optical properties of γ-La2S3 ceramics. A phase analysis indicated that the least appropriate Na+ dose to stabilize γ-La2S3 was Na/La = 1 : 20. IR transmission measurements showed that the pellet with Na/La = 1 : 20 had a higher infrared transmittance than other pellets, and the maximum transmittance reached 64.5% at 13 µm, which was near the theoretical transmittance of a γ-La2S3 crystal.
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