University of Oulu

Kuzmić N, Škapin SD, Nelo M, Jantunen H and Spreitzer M (2021) Dielectric Properties of Upside-Down SrTiO3/Li2MoO4 Composites Fabricated at Room Temperature. Front. Mater. 8:669421. doi: 10.3389/fmats.2021.669421

Dielectric properties of upside-down SrTiO3/Li2MoO4 composites fabricated at room temperature

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Author: Kuzmic, Nina1,2; Škapin, Srečo Davor1; Nelo, Mikko3;
Organizations: 1Advanced Materials Department, Jožef Stefan Institute, Ljubljana, Slovenia
2ožef Stefan International Postgraduate School, Ljubljana, Slovenia
3Microelectronics Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.3 MB)
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Language: English
Published: Frontiers Media, 2021
Publish Date: 2021-06-28


In this paper, ceramic upside-down lithium molybdate-strontium titanate (LMO-ST) composites fabricated at room temperature are described. Room temperature fabrication (RTF) is a promising alternative to the time- and energy-consuming high-temperature sintering of electroceramics, which involves mixing of the initial phases, molding with a steel dye, pressing, and drying, while in the last two phases the action of densification takes place. The LMO-ST composites are based on a high ratio of filler ST, coupled with the corresponding LMO binder. Part of the binder is admixed to the ceramic particles and additional part is added as a saturated aqueous solution, which crystallizes during pressing and drying, leading to its deposition on the surface of the filler particles. As a result, sufficient binding with 76—84% relative density was achieved. The deeper insight into the method was provided by various processing aspects and corresponding microstructural investigations. The particle size distribution, pressure, pressing time, ultrasonic treatment, drying time and processing conditions were optimized to obtain improved functional properties of the LMO-ST composites. The results of this study with relative permittivity in the range of 65—78 and dielectric loss tangent values of 0.002—0.05 can attract considerable attention for the use of LMO-ST composites in the industry of electroceramics.

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Series: Frontiers in materials
ISSN: 2296-8016
ISSN-E: 2296-8016
ISSN-L: 2296-8016
Volume: 8
Article number: 669421
DOI: 10.3389/fmats.2021.669421
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: NK, SŠ, and MS would like to acknowledge funding from Slovenian Research Agency (PR-09775 and P2-0091).
Copyright information: © 2021 Kuzmić, Škapin, Nelo, Jantunen and Spreitzer. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.