Abstract
The defects/nanopores conversion in the Cu0.1Ni0.8Co0.2Mn1.9O4 ceramics caused by addition phase and monolithization process was studied by positron annihilation lifetime spectroscopy using three-component decomposition of spectra within mixed positron- and positronium-trapping modes. It is established that a larger amount of addition NiO phase in ceramics resulted in void fragmentation with future agglomeration due to monolitization processes. The NiO extracted near intergranular boundaries formed new positron-trapping sites in the Cu0.1Ni0.8Co0.2Mn1.9O4 ceramics. Monolithization of ceramics is accompanied by agglomeration of nanopores with radius centered near 0.3 nm.






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Acknowledgements
HK and YK thank the Ministry of Education and Science of Ukraine for support (project for young researchers No. 0119U100435), Dr. A. Ingram for assistance in PAL experiments, Prof. O. Shpotyuk and Dr. V. Balitska for discussion. In addition, the research of HK, SY and BS has been supported the Ministry of Education and Science of Ukraine (project No. 0120U102205).
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Klym, H., Hadzaman, I., Kostiv, Y. et al. Free-volume defects/nanopores conversion of temperature-sensitive Cu0.1Ni0.8Co0.2Mn1.9O4 ceramics caused by addition phase and monolithization process. Appl Nanosci 12, 1347–1354 (2022). https://doi.org/10.1007/s13204-021-01963-9
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DOI: https://doi.org/10.1007/s13204-021-01963-9

