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Evaluation of Hot Pressing and Hot Isostastic Pressing Parameters on the Optical Properties of Spinel

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The effect of different hot pressing and hot isostatic pressing (HIP) temperatures and pressures on the optical properties of spinel was studied. Extinction coefficients of spinel samples were estimated by comparing the measured transmittance with the theoretical transmittance as calculated via a Sellmeier model. Results showed that the relative size of the scattering sites was large compared with the wavelengths of light (0.35–5.5 m). Overall, increasing HIP temperature and pressure resulted in decreasing the optical extinction. The lower of two hot pressing temperatures (1620° vs 1650°C) prior to HIPing resulted in lower scatter coefficients after HIPing; this effect was most significant in the infrared.
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Document Type: Research Article

Affiliations: 1: U.S. Army Research Laboratory, Attn. AMSRL-WM-MC, Aberdeen Proving Ground, Maryland 21005 2: The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723

Publication date: 01 October 2005

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