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Novel transparent Y2Sn2O7 and La2Sn2O7 pyrochlore ceramics: A‑site cation engineering for tailoring structural and optical properties
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DOI：10.1016/j.jeurceramsoc.2026.118757.png)
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Abstract
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• Transparent Y2Sn2O7 and La2Sn2O7 ceramics are fabricated for the first time via oxygen‑atmosphere‑controlled sintering. • DFT calculations reveal the direct bandgap nature and covalent Sn–O vs. ionic Ln–O bonding characteristics. • Y2Sn2O7 exhibits a higher oxygen vacancy content, causing relatively large grain size compared with La2Sn2O7. • Both ceramics show high transmittances of ‒69.3‒70.3% at 633 nm, high refractive indices of 2.0 , and large Abbe numbers of 28.0‒28.8. • The A‑site cation governs oxygen non‑stoichiometry, which affects microstructure, fracture mode, and optical properties.
Keywords:
High refractive index
Transparent ceramics
Stannate
Oxygen vacancy
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6.2
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1.7W
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5.1W
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