Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Vis and NIR Diffused Reflectance Study in Disordered Bismuth Manganate ‒ Lead Titanate Ceramics

Version 1 : Received: 28 October 2021 / Approved: 29 October 2021 / Online: 29 October 2021 (10:13:45 CEST)

How to cite: Molak, A.; Szeremeta, A.Z.; Koperski, J. Vis and NIR Diffused Reflectance Study in Disordered Bismuth Manganate ‒ Lead Titanate Ceramics. Preprints 2021, 2021100449 (doi: 10.20944/preprints202110.0449.v1). Molak, A.; Szeremeta, A.Z.; Koperski, J. Vis and NIR Diffused Reflectance Study in Disordered Bismuth Manganate ‒ Lead Titanate Ceramics. Preprints 2021, 2021100449 (doi: 10.20944/preprints202110.0449.v1).

Abstract

This work shows a correlation between light reflectance, absorption, and morphologies of series of (1-x) BM–x PT, (x = 0.0, 0.02, 0.04, 0.08, 0.12, 0.16, 0.24) ceramics composite. The (1-x) BM–x PT showed features of a black mirror with a low optical energy gap. The measured Vis-NIR diffused reflectance enabled the calculation of the energy gap using the modified Kubelka-Munk function. The estimated energy gap was lower than 1.5 eV related to low reflectance in the Vis-NIR range. Moreover, obtained histograms of grains, using scanning electron microscope, enabled the correlation between grains size and amount of lead titanate. We deduced from the ceramics surface morphology that marked porosity also induced reflectivity of low magnitude. We correlated the magnitude of the energy gap with phases of the BM-PT composite and with the electrical conductivity activation energy reported in the literature. Our results findings opened prospect studied materials for optical applications.

Keywords

bismuth manganite; ceramics; composite; lead titanate; optical energy gap; surface morphology; Vis-NIR reflectance

Subject

PHYSICAL SCIENCES, Applied Physics

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