Proprietati intrinseci in materiale dielectrice de microunde investigate prin spectroscopie de terahertzi in domeniul temporal


Project Director: Dr. Liviu NEDELCU

Principalul obiectiv al proiectului este investigarea surselor extrinseci care degradeaza permitivitaea complexa a dielectricilor/ferroelectricilor cu pierderi scazute in microunde, unde milimetrice si unde submilimetrice. Studiile se vor concentra asupra dispersiei pe banda foarte larga de frecvente a unor dielectrici (e.g. titanati, tantalati) si a unor filme feroelectrice pe baza de titanat de bariu, cu diferite microstructuri. In acest sens vor fi preparate esantioane prin utilizarea mai multor tehnici experimentale (tehnologie ceramica conventionala, sinterizare cu descarcare in plasma, pulverizare catodica in radio frecventa si ablatie cu fascicol laser pulsat).

Dr. Liviu Nedelcu - director de proiect

Dr. George Stan - cercetator postdoctoral

Dr. Aurelian-Cătălin Gâlcă – cercetator postdoctoral

Dr. Cristina Chirila - cercetator postdoctoral

Mihai Burdusel - doctorand

  • Ceramici ZST dopate cu pierderi reduse prin CTT;
  • Ceramici ZST nedopate cu pierderi reduse si densificare de 99,9 % prin SPS;
  • Ceramici BMT cu pierderi extrem de reduse prin CTT;
  • Ceramici BMT dezordonate cu pierderi reduse si densificare de 98,5 % prin SPS;
  • Filme BST groase prin PLD si RFMS;
  • Algoritm pentru extragerea proprietatilor dielectrice din datele de THz-TDS.

Prezentari la conferinte

1. L. Nedelcu, G. Annino, C. Chirila, L. Trupina, A. C. Galca, M. G. Banciu, Terahertz and optical properties of Ba0.6Sr0.4TiO3 thick films grown by PLD, EMRS 2019 Spring Meeting, 27 – 31 May 2019, Nice, France

2. L. Nedelcu, C. Chirila, G. E. Stan,  A. C. Galca, L. Hrib, L. Trupina,  C. D. Geambasu, M. G. Banciu, Terahertz characterization of (Ba,Sr)TiO3 ferroelectric films grown by PLD and RF magnetron sputtering, 20th International Balkan Workshop on Applied Physics and Materials Science, 14-17 July 2019, Constanta, Romania

 

Lucrari extinse

1. L. Nedelcu, M. Burdusel, M. A. Grigoroscuta, C. D. Geambasu, M. G. Banciu, P. Badica, Extrinsic absorption in spark plasma sintered Zr0.8Sn0.2TiO4 ceramics investigated by terahertz time-domain spectroscopy, IEEE Proceedings of the 44th International Conference on Infrared, Millimeter, and Terahertz Waves, 1-6 September 2019, Paris, France.

https://doi.org/10.1109/IRMMW-THz.2019.8873760

2. M.G. Banciu, D.C. Geambasu, L. Nedelcu, L. Trupina, Frequency selective surfaces with hexagonal elements for millimeter waves applications, Proceedings of the 42th International Semiconductor Conference, 9-11 October 2019, Sinaia, Romania

https://doi.org/10.1109/SMICND.2019.8923621

3. G. Banciu, L. Nedelcu, T. Furuya, L. Hrib, D. C. Geambasu, L. Trupina, D. Pantelica, M.-D. Mihai, M. Tani, Experimental study of terahertz response from some ferroelectric and dielectric materials, Proceedings of the Romanian Academy, Series A 20 (2019) 353.

4. L. Nedelcu, G. Annino, C. Chirila, L. Trupina, A. C. Galca, M. G. Banciu, Investigation of Ba0.6Sr0.4TiO3 thick films by means of a novel THz-TDS approach, Applied Surface Science 506, (2020) 144807.

https://doi.org/10.1016/j.apsusc.2019.1448075

5. L. Nedelcu, C. D. Geambasu, M. Enculescu, M. G. Banciu, Intrinsic dielectric loss in Zr0.8Sn0.2TiO4 ceramics investigated by terahertz time domain spectroscopy, in proces de evaluare la Materials.

Dr. Liviu NEDELCU

Cercetator Stiintific gr. II

Laboratorul "Materiale si Structuri Multifunctionale"


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