Evidence of Hole Self-Doping due to Excess Oxygen Addition in Polycrystal LaMnO3
| Autor: | Tetsuo Shimizu, H. Kobori, Atsushi Yamasaki, Megumi Sogabe, T. Taniguchi, Akinori Hoshino |
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| Rok vydání: | 2021 |
| Předmět: |
0303 health sciences
Materials science Condensed matter physics Mechanical Engineering Doping 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 03 medical and health sciences Mechanics of Materials Electrical resistivity and conductivity General Materials Science Excess oxygen 0210 nano-technology 030304 developmental biology |
| Zdroj: | Materials Science Forum. 1023:9-13 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.1023.9 |
| Popis: | We have presented the evidence of hole self-doping due to excess oxygen addition in polycrystal LaMnO3(LMO). The polycrystal LMO samples were prepared by use of a solid-state reaction method. Powder mixtures with a molar ratio of 1:1 between La2O3and Mn2O3were pre-annealed at 1100oC for 18 hours in the atmospheres of oxygen gas, helium gas and vacuum. By this heat treatment, non-crystalline LMO samples were produced. After that, the non-crystalline LMO samples were grinded and were pressed into pellets at the pressure of 3t/cm3. The pellets were annealed at 1100oC and 1300oC for 18 hours in the same atmospheres as the pre-annealing. Through these processes, polycrystal LMO samples were finally produced. To investigate crystallographic structure of the LMO samples, X-ray diffraction (XRD) measurements were performed by use of Cu-K radiation. From the experimental results of XRD measurements, we have found that all LMO samples have perovskite structure and are polycrystals. In addition, to investigate surface structure of the LMO samples, scanning electron microscope (SEM) measurements were carried out. Electrical resistivities (ERs) of the polycrystal LMO samples were measured as a function of temperature (4K-300K). The ERs of polycrystal LMO samples produced in an oxygen gas atmosphere show lower values as compared with other LMO ones in He gas and vacuum atmospheres. Especially, the temperature dependence of the ER for a polycrystal LMO sample produced at the annealing temperature of 1100oC in an oxygen atmosphere shows a metallic behavior. Thus, we have considered that this LMO sample has the largest hole self-doping concentration in all LMO ones. |
| Databáze: | OpenAIRE |
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