Journal article
Dielectric and magnetic properties of KTaO3 co-doped with Li and Co: size effects
Functional materials, v 28(3), pp 427-436
01 Jan 2021
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Abstract
We present dielectric and magnetic properties of potassium tantalate KTaO3 co-doped with Li (4 mol.%) and Co(4 mol. %) for different powder particle sizes: 200 nm (submicron crystals) and 80 nm (nanosized crystals). As-synthesized submicron crystals have a cubic shape with rounded corners, while nanosized crystals have an elongated parallelepiped shape with clear even edges. The dielectric relaxation parameters of Li atoms are determined using the Vogel-Fulcher law: activation energy E-a = 0.0167 eV and characteristic frequency v(o) = 10(7) Hz. A significant decrease in these parameters was found in comparison with KTaO3 doped only with lithium, which indicates the role of cobalt in the dynamics of off-center lithium atoms. The kinetic parameters describing the relaxation behavior of Co atoms are also determined. The parameters are found to be very close: E-a = 0.387 +/- 0.05 eV, v(o) = (2.5 +/- 0.8).10(13) Hz and E-a = 0.391 +/- 0.05 eV, v(o) = (3 +/- 1).10(13) Hz for a submicron and nanosized sample, respectively. The formation of cluster magnetism with the presence of clusters of different sizes is established. As the temperature changes from 110 to 290 K,the average size of clusters increases from 2115 to 3360 and from 3071 to 5577 Co atoms per cluster for a submicron and nanosized sample, respectively.
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Details
- Title
- Dielectric and magnetic properties of KTaO3 co-doped with Li and Co: size effects
- Creators
- S. Lemishko - Natl Acad Sci Ukraine, V Lashkaryov Inst Semicond Phys, 41 Nauky Ave, UA-03028 Kiev, UkraineO. O. Andriiko - Natl Tech Univ Ukraine, Igor Sikorsky Kyiv Polytech Inst, 37 Perem Ave, UA-03056 Kiev, UkraineM. M. Prokopiv - Natl Acad Sci Ukraine, V Bakul Inst Superhard Mat, 2 Avtozavodska Str, UA-04074 Kiev, UkraineM. O. Tripachko - Natl Acad Sci Ukraine, Inst Phys, 46 Nauky Ave, UA-03020 Kiev, UkraineI. S. Golovina - Natl Acad Sci Ukraine, V Lashkaryov Inst Semicond Phys, 41 Nauky Ave, UA-03028 Kiev, Ukraine
- Publication Details
- Functional materials, v 28(3), pp 427-436
- Publisher
- Natl Acad Sciences Ukraine, Inst Single Crystals
- Number of pages
- 10
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000704706000004
- Scopus ID
- 2-s2.0-85118632005
- Other Identifier
- 991019302021404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary