Intra-grain polarized infrared spectroscopy realized in domain-engineered Zn2GeO4 ceramics
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Intra-grain infrared spectroscopy was carried out on a domain-engineered ceramic with abnormally large grains. The model system used was a polycrystalline Zn2GeO4 ceramic sample, with a rhombohedral crystal structure and giant grain microstructure (50–350 μm). The micro-infrared spectra unveiled preferential crystal orientations for the different grains. Polarized spectra revealed well-defined crystallographic domains inside the ceramic grains. Appropriate crystallographic planes for full assignment of the infrared modes were found by polarized infrared light. This allowed the first realization of a polarization-resolved symmetry assignment of an as-grown ceramic material. A sound description of the polar phonon features of rhombohedral Zn2GeO4 is then presented. Also, an infrared spectroscopic mapping of the crystallographic domains inside the ceramic grains is demonstrated.
Abstract
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Material cerâmico, Difusão em sólidos, Microestrutura, Espectroscopia de infravermelho, Semicondutores, Semicondutores policristalinos
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Ceramics, Lattice dynamics, Microstructure, Infrared spectroscopy, Dielectric properties
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https://www.sciencedirect.com/science/article/pii/S0025540819306816