Multifunctional dielectric materials produced by spark plasma sintering for passive microwave devices
Project Director: Dr. Nedelcu Liviu
Project Director: Liviu NEDELCU
Project Type: National
Funded by: Executive Unit for Financing Higher Education, Research, Development and Innovation (UEFISCDI)
Contractor: National Institute of Materials Physics
Project Status: In progress
Start Date: 23 October, 2020
End Date: 21 October, 2022
Project summary
The main objective of the project is to exploit the versatility of the spark plasma sintering (SPS) technique in order to prepare Zr1-xSnxTiO4 (ZST) solid solutions with various shapes whose multifunctional properties set the ground for development of the new generation of high performance microwave devices. Even though has several advantages, SPS can produce a lot of oxygen vacancies in oxide materials and such defects increase the dielectric loss. In order to overcome this drawback, as-sintered sample will be ex-situ annealed in air or oxygen atmosphere. Apart of usual structural and morphological characterizations, the extrinsic contribution to the losses will be investigated by microwave spectroscopy and terahertz time-domain spectroscopy. Through the analysis of the “synthesis - microstructure – properties” cycle, the technology suitable for fabrication of “zero-porosity” ZST ceramics with low dielectric loss in microwave domain will be developed. The targeted results would allow achieving of materials with multifunctional properties with a breakthrough potential in terms of efficiency and cost-effectiveness of the passive microwave devices.
Dr. Liviu Nedelcu
Dr. Petre Badica
Dr. Marian Gabriel Banciu
Dr. Monica Enculescu
Dr. Iuliana Pasuk
Dr. Lucian Trupina
Dr. Viorica Stancu
Dr. Cristina Bartha
Dr. Cristina Besleaga
Dr. Mihail Burdusel
Dr. Mihai Grigoroscuta
Eng. Dragos Cesar Geamnasu
Teh. Dalma Gaspar
Stage 1 (2020)
- Single-phase ZST powders obtained by solid-state reaction
Stage 2 (2021)
- ZST dielectric resonators with cylindrical shapes fabricated by SPS
- ZST dielectric resonators with polyhedral shapes fabricated by SPS
- Electromagnetic models of various shapes dielectric antennas based on various shape ZST resonators.
Stage 2 (2021)
Intenational conferences
1. L. Nedelcu, C. D. Geambasu, M. G. Banciu, M. Burdusel, M. A. Grigoroscuta, P. Badica, Extrinsic and intrinsic losses in Zr0.8Sn0.2TiO4 ceramics investigated by microwave and terahertz spectroscopy, E-MRS SPRING MEETING 2021, virtual conference, May 31- June 3, 2021.
2. M. G Banciu, C. D. Geambasu, L. Nedelcu, Modes investigation of prismatic dielectric elements for microwave antennas, 44th International Semiconductor Conference (CAS 2021), virtual event, 6-8 October, 2021.
ISI Journals
1. L. Nedelcu, M. Burdusel, M. Grigoroscuta, C. D. Geambasu, M. Enculescu, P. Badica, M. G. Banciu, Microwave and terahertz properties of spark plasma sintered Zr0.8Sn0.2TiO4 ceramics, manuscript in preparation for Materials
Dr. Liviu Nedelcu
nedelcu@infim.ro
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