Tuning the Optical and Mechanical Properties of Y2O3 Ceramics by the Inclusion of La3+ Ion in the Matrix for Infrared Transparent Window Applications

Mathew C.T
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引用次数: 1

Abstract

Infrared transparent windows are generally used to protect highly delicate infrared sensor circuits from the harsh environments. In the present work a combustion technique was effectively used to incorporate La3+ ion in the yttria matrix. The crystallites were in the size limit of 20 nm. Powder characterization using X-ray diffraction, HRTEM and FTIR spectroscopy revealed that the La3+ ions were effectively replacing the Y3+ ion in the yttria matrix. There was a slight reduction in optical band gap with La3+ concentration. A novel sintering mechanism was used for sintering the samples by coupling definite proportions of resistive heating and microwave heating. The highly dense pellets showed better transmittance and hardness properties, which improved with La3+concentration. The present study authorises that combustion synthesis of the samples followed by resistive coupled microwave sintering can effectively be used to tune the optical and mechanical, properties of infrared transparent ceramics. Improving the transmittance properties without deteriorating the mechanical properties through the resistive coupled microwave sintering is the major highlight of this novel work.
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用La3+离子修饰Y2O3陶瓷在红外透明窗口中的光学和力学性能
红外透明窗通常用于保护高度精密的红外传感器电路免受恶劣环境的影响。本文采用燃烧技术有效地将La3+离子掺入到钇基体中。晶粒尺寸在20 nm左右。粉末的x射线衍射、HRTEM和FTIR表征表明,La3+离子有效地取代了钇基体中的Y3+离子。随着La3+浓度的增加,光学带隙略有减小。采用一定比例的电阻加热和微波加热相结合的烧结机理对样品进行了烧结。高密度球团具有较好的透光性和硬度,且随La3+浓度的增加而提高。本研究表明,燃烧合成后的电阻耦合微波烧结可以有效地调节红外透明陶瓷的光学和机械性能。通过电阻耦合微波烧结在不破坏材料力学性能的前提下提高透光性能是本研究的主要亮点。
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