Influence of Yttrium Concentration on Local Structure in BaZr1–xYxO3−δ Based Proton Conductors
| Autor: | Christopher S. Knee, Caroline W. Mburu, Samuel Mwaniki Gaita, Michael J. Gatari, Maths Karlsson |
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| Rok vydání: | 2017 |
| Předmět: |
Dopant
Proton Hydrogen bond Chemistry Infrared Inorganic chemistry Analytical chemistry chemistry.chemical_element Infrared spectroscopy 02 engineering and technology Yttrium Crystal structure Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 121:16174-16181 |
| ISSN: | 1932-7455 1932-7447 1700-4500 |
| DOI: | 10.1021/acs.jpcc.7b05023 |
| Popis: | The evolution of local structure, coordination of protons, and proton conductivity in yttrium-doped barium zirconate, BaZr1-xYxO3-delta (x = 0-0.5), has been investigated using thermal-gravimetric analysis, impedance spectroscopy, and infrared spectroscopy. Low-frequency (50-1000 cm(-1)) infrared absorbance spectra provide evidence of increasing local structural distortions as a function of yttrium concentration as well as subtle differences, mainly linked to the oxygen sublattice, between the dry and hydrated samples. High-frequency (1700-4500 cm(-1)) spectra of the hydrated samples, distinguished by a broad O-H stretch continuum, manifest a varying degree of hydrogen bond interactions between the protons and nearest neighbor oxygens due to the disordered crystal structure with a general weakening in. particular of the strongest hydrogen bonding interactions with increasing dopant levels. It is argued that compositions within the range 0.15 |
| Databáze: | OpenAIRE |
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