Publications
1.
T. Koutzarova, S. Kolev, K. Krezhov, Ch. Ghelev,
B. Vertruyen, L.M. Tran, A. Zaleski, Chapter 3: "Preparation and
phase transitions in Y-type magneto-electric hexaferrites", Advances
in Materials Science Research vol. 41, Editor: Maryann C. Wythers, Nova Science
Publishers, Inc. p.105-151 (2020) ISBN: 978-1-53617-785-5
https://novapublishers.com/shop/advances-in-materials-science-research-volume-41/
2.
S.
Kolev, P. Peneva, K. Krezhov, T. Malakova, Ch. Ghelev, T. Koutzarova, D.
Kovacheva, B. Vertruyen, R. Closset, L. M. Tran, A. Zaleski, "Structural,
magnetic and microwave characterization of polycrystalline Z-type Sr3Co2Fe24O41
hexaferrite", Materials, vol. 13, art. num. 2355 (16), (2020) open access
https://www.mdpi.com/1996-1944/13/10/2355/htm
3.
T. Koutzarova, S.
Kolev, K. Krezhov, B. Georgieva, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R.
Closset, L. M. Tran, M. Babij, A. J. Zaleski, "Ni-substitution effect
on the properties of Ba0.5Sr1.5Zn2-xNixFe12O22
powders", Journal of Magnetism and Magnetic Materials, vol.
505, art.num. 166725 (6), (2020)
https://www.sciencedirect.com/science/article/pii/S0304885319336285?via%3Dihub
4.
T. Koutzarova, S.
Kolev, K. Krezhov, B. Georgieva, D. Kovacheva, Ch. Ghelev, B. Vertruyen, F.
Boschini, A. Mahmoud, L.M. Tran, A. Zaleski, "Study of the structural and
magnetic properties of Co-substituted Ba2Mg2Fe12O22
hexaferrites synthesized by sonochemical co-precipitation", Materials,
vol. 12 art. num. 1414
(9), (2019) open access
https://www.mdpi.com/1996-1944/12/9/1414/htm
5.
B. Georgieva, S.
Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L.M.
Tran, M. Babij, A. Zaleski, T. Koutzarova, “Structural and magnetic
characterization of Y-type hexaferrite powders prepared by sol-gel
auto-combustion and sonochemistry”, Journal of Magnetism and Magnetic
Materials, vol. 477, pp. 131-135 (2019)
https://www.sciencedirect.com/science/article/pii/S0304885318329354
6.
K.
Krezhov, Al. Mladenov, D. Dimitrov, "Radon concentrations and
equivalent dose measurements at the IRT-Sofia research reactor site", Radiation Protection Dosimetry, vol.
181, pp. 42-47 (2018)
DOI: 10.1093/rpd/ncy088
7.
T. Koutzarova, S.
Kolev, K. Krezhov, B. Georgieva, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R.
Closset, L. M. Tran, M. Babij, A. J. Zaleski, "Data supporting the
results of the characterization of the phases and structures appearing during
the synthesis process of Ba0.5Sr1.5Zn2-xNixFe12O22
by auto-combustion", Data in Brief, vol. 31, art. num. 105803 (7) (2020) open access
https://www.sciencedirect.com/science/article/pii/S2352340920306971
8.
T. Koutzarova, B.
Georgieva, S. Kolev, Ch. Ghelev, K. Krezhov, D. Kovacheva, B. Vertruyen, R.
Closset, L.M. Tran, A. Zaleski, "Structural study of thick hexaferrite
films", J. Phys.: Conf. Ser., vol. 1492, art. num. 012064 (5) (2020)
https://iopscience.iop.org/article/10.1088/1742-6596/1492/1/012064/pdf
9. P. Dankov, V.
Levcheva, S. Kolev, T. Koutzarova, "Characterization of multilayer
nano-absorbers", J. Phys.: Conf. Ser., vol. 1492, art. num. 012047 (7) (2020)
https://iopscience.iop.org/article/10.1088/1742-6596/1492/1/012047/pdf
10. P. Dankov, S. Kolev, T. Koutzarova, "Dielectric and magnetic properties of Sr3Co2Fe24O41 thin hexaferrite samples in the microwave range", J. Phys.: Conf. Ser., vol. 1492, art. num. 012048 (6) (2020)
https://iopscience.iop.org/article/10.1088/1742-6596/1492/1/012048/pdf
11. B. Georgieva, T.
Koutzarova, S. Kolev, K. Krezhov, D. Kovacheva, Ch. Ghelev, B. Vertruyen, L.M.
Tran, A. Zaleski, "Study of Y-type hexaferrite Ba0.5Sr1.5ZnNiFe12O22
powders", AIP Conference Proceedings, vol. 2075 Art. Num.160032
(2019) - SJR-0.19
https://aip.scitation.org/doi/10.1063/1.5091359
12. T. I. Lazarova, D. G. Kovacheva, “A new phase obtained by oxidation of
nanosized spinel MnFe2O4”, Bulgarian Chemical
Communications, vol. 50, Special Issue F, pp. 163–166 (2018)
http://www.bcc.bas.bg/
13.
T. Malakova, K.
Krezhov, Ts. Nonova, “Half Replacement of Bismuth by Neodymium in Half-Hole
Doped Bismuth-Based Manganites Bi0.25Nd0.25X0.5MnO3
(X = Sr, Ca): a Neutron Diffraction Study”, Journal of Surface
Investigation: X-ray, Synchrotron and Neutron Techniques, vol. 14, Suppl.
1, pp. S117–S121, (2020)
https://link.springer.com/article/10.1134/S1027451020070307
14.
T. Koutzarova,
Ch. Ghelev, P. Peneva, B. Georgieva, S. Kolev, B. Vertruyen, R. Closset, "Hexaferrite
multiferroics: From bulk to thick films", Journal of Physics:
Conference Series, vol 992 Art. Num.
012058 (2018)
http://iopscience.iop.org/article/10.1088/1742-6596/992/1/012058/pdf
15.
B. Georgieva, S.
Kolev, Ch. Ghelev, T. Koutzarova, D. Kovacheva, B. Vertruyen, R. Closset, Chapter:
"A comparative study of the morphology of Y-type hexaferrite powders
obtained by sol-gel auto-combustion and ultrasonic co-precipitation",
in Advanced Nanotechnologies for Detection and Defence against CBRN Agents,
NATO Science for Peace and Security Series B: Physics and Biophysics, Eds. P.
Petkov, D. Tsiulyanu, C. Popov, W. Kulisch, Springer, Dordrecht, (2018), p. 31-36, ISBN 978-94-024-1297-0
https://www.springer.com/gp/book/9789402412970
16. B. Georgieva, K. Krezhov, S. Kolev, Ch. Ghelev, D. Kovacheva, M. Fabian, E. Svab, T. Koutzarova, "Characterization of Y-type hexaferrite Ba2Mg2Fe12O22 powders", Proceedings of the International Spring Seminar on Electronics Technology, p. 39-44, Article number 8000885 (2017), ISSN: 2161-2536
https://ieeexplore.ieee.org/document/8000885
17.
T. Koutzarova, B.
Georgieva, S. Kolev, K. Krezhov, D. Kovacheva, Ch. Ghelev, B. Vertruyen, F.
Boschini, A. Mahmoud, L. M. Tran, A. Zaleski, "Study of the properties
of Co-substituted Ba2Mg2Fe12O22
hexaferrites", Proceedings
of The 3rd International Electronic Conference on Materials Sciences, Published: 17 May 2018 by MDPI AG, DOI:
10.3390/ecms2018-05229
https://sciforum.net/paper/view/conference/5229
18.
P. Peneva, S.
Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L. M.
Tran, A. Zaleski, T. Koutzarova, "Structural properties and magnetic
phase transitions in Z-type Sr3Co2Fe24O41
hexaferrites", Nanoscience & Nanotechnology: Nanostructured
materials application and innovation transfer, 18 (2), pp. 19-22, (2018)
CONFERENCES
1. B. Georgieva, K. Krezhov, S. Kolev, Ch. Ghelev, D. Kovacheva, M. Fabian, E. Svab, T. Koutzarova, „Characterization of Y-type hexaferrite Ba2Mg2Fe12O22 powders“ 11th Central European Training School on Neutron Technique - CETS2017, 8-12 May, Budapest, Hungary.
2. B. Georgieva, T. Koutzarova, S. Kolev, K. Krezhov, Daniela Kovacheva, „Obtaining and Characteristics of Y-type Hexaferrite Ba2Mg2Fe12O22 Powders“, The Jubilee 40th International Spring Seminar on Electronics Technology, 10-14 May 2017, Sofia, Bulgaria.
3. B. Georgieva, S. Kolev, Ch. Ghelev, B. Vertruyen, R. Closset, T. Koutzarova, "A comparative study of properties of Y-type hexaferrite powders obtained by sol-gel auto-combustion and sonochemical co-precipitation", Advanced Nanotechnologies for Detection and Defence against CBRN Agents, 12-20 September 2017, Sozopol, Bulgaria.
4. T. Koutzarova, Ch. Ghelev, P. Peneva, B. Georgieva, S. Kolev, B. Vertruyen, R. Closset, „Hexaferrite Multiferroics: From Bulk to Thick Films”, 20th International Summer School on Vacuum, Electron and Ion Technologies, 25 − 29 September, Sozopol, Bulgaria.
5. P. Peneva, T. Koutzarova, S. Kolev, Ch. Ghelev, B. Vertruyen, R. Closset, R. Cloots, A. Zaleski, "Structure and Magnetic Properties of Sr3Co2Fe24O41", International Autumn School on Fundamental and Electron Crystallography, 08 – 13 October 2017, Sofia, Bulgaria.
6. P. Tzvetkov, D. Kovacheva, Blagoy Blagoev, Nikolay Velinov, "Cation ordering and magnetic properties of Pb(Ba,Sr)Fe2-x(Co,Mn,Cr)xO5 perovskite-type compounds", International Autumn School on Fundamental and Electron Crystallography, 08 – 13 October 2017, Sofia, Bulgaria.
7. K. Krezhov, "Crystal structure of Y-type hexaferrite powders and mixed sodium cobalt-manganese sulphate", 25th Meeting of the International Scientific Advisory Council (ISAC) Workshop on Exploring Future Opportunities in Science and Innovation at BNC 10 November 2017.
8. P. Peneva, S. Kolev, Ch. Ghelev, B. Vertruien, A. Zaleski, T. Koutzarova, "Influence of Al-substitution on the structure and magnetic properties of BaFe12O19", VI National Student Scientific Session in Physics and Engineering Technologies, 16 – 18.11.2017, Plovdiv, Bulgaria.
9. P. Peneva, S. Kolev, Ch. Ghelev, B. Vertruyen, R. Closset, R. Cloots, A. Zaleski, D. Kovacheva, T. Koutzarova, "Structural properties and magnetic phase transitions in Z-type Sr3Co2Fe24O41 hexaferrites", 19th International Workshop on Nanoscience and Nanotechnology - NANO 2017, 24 – 25 Nov. 2017 Sofia, Bulgaria.
10. B. Georgieva, S. Kolev, K. Krezhov, D. Kovacheva, Ch. Ghelev, B. Vertruyen, R. Closset, R. Cloots, A. Zaleski, T. Koutzarova, "Study of the properties of Co-substituted Ba2Mg2Fe12O22 hexaferrites", 19th International workshop on Nanoscience and Nanotechnology NANO2017, 24 – 25 Nov. 2017 Sofia, Bulgaria.
11. B. Georgieva, S. Kolev, K. Krezhov, D. Kovacheva, Ch. Ghelev, B. Vertruyen, R. Closset, A. Mahmoud, R. Cloots, A. Zaleski, T. Koutzarova, "Structural and magnetic properties of Ba2Mg0.4Co1.6Fe12O22 hexaferrites", Joint meeting of the DPG and EPS Condensed Matter Divisions (DPG Spring Meeting and EPS-CMD), 11 – 16 March 2018, Berlin, Germany.
12. T. Koutzarova, S. Kolev, P. Peneva, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L. M. Tran, A. Zaleski, "Z-type hexaferrite - synthesis, characterization and magnetically induced reflection losses at 1-20 GHz", 6th International Conference on Superconductivity and Magnetism- ICSM2018, 29 April - 4 May, 2018, Beldibi/Antalya, Turkey.
13. T. Koutzarova, B. Georgieva, S. Kolev, K. Krezhov, D. Kovacheva, Ch. Ghelev, B. Vertruyen, F. Boschini, A. Mahmoud, L. M. Tran, A. Zaleski, "Study of the properties of Co-substituted Ba2Mg2Fe12O22 hexaferrites", The 3rd International Electronic Conference on Materials Sciences https://sciforum.net/paper/view/conference/5229, on-line презентация
14. K. Krezhov, P. Peneva, T. Koutzarova, S. Kolev, Ch. Ghelev, B. Vertruyen, Catherine Henrist, A. Zaleski, "Structure and magnetic properties of nanosized Al-substituted barium hexaferrite powders obtained by single microemulsion method", 6th International Conference on Radiation and Applications in Various Fields of Research, 18-26 June 2018, Ohrid, Macedonia.
15. T. Koutzarova, S. Kolev, B. Georgieva, K. Krezhov, D. Kovacheva, Ch. Ghelev, B. Vertruyen, R. Closset, L. M. Tran, A. Zaleski “Y-type hexaferrite - synthesis, characterization and magnetically-induced reflection losses at 1-20 GHz”, IEEE International Conference on Microwave Magnetics 2018, 24 – 27 June 2018, University of Exeter, UK.
16. B. Georgieva, S. Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L. M. Tran, A. Zaleski, T. Koutzarova, „Structural and magnetic characterization of Y-type hexaferrite powders obtained by solgel auto-combustion and sonochemistry“, JEMS 2018, 03 – 07 September, 2018 - Mainz, Germany.
17. B. Georgieva, T. Koutzarova, S. Kolev, K. Krezhov, D. Kovacheva, Ch. Ghelev, B. Vertruyen, L.M. Tran, and A. Zaleski, “Study of Y-type hexaferrite Ba0.5Sr1.5ZnNiFe12O22 powders”, 10th Jubilee Conference of the Balkan Physical Union (BPU10), 26 – 30 August, 2018, Sofia, Bulgaria.
18. T. Koutzarova, K. Krezhov, E. Popov, P. Peneva, S. Kolev, Ch. Ghelev, А. Beskrovny, B. Vertruyen, A. Zaleski, L. M. Tran, “Structural and magnetic properties of aluminum doped barium ferrite nanoparticles prepared by citric acid auto-combustion route”, Conference on the Use of Neutron Scattering in Condensed Matter, NSCM-2018, 17 - 21 September 2018 , Russia, St. Petersburg, Peterhof.
19. B. Georgieva, S. Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L.M. Tran, M. Babij, A. Zaleski, T. Koutzarova, “Study of Y-type hexaferrite thick films deposition”, 21th International Summer School on VEIT, 23−27.09.2019, Sozopol, Bulgaria
20. P. Dankov, V. Levcheva, S. Kolev, T. Koutzarova, “Characterization of multilayer nano-absorbers”, 21th International Summer School on VEIT, 23−27.09.2019, Sozopol, Bulgaria.
21. P. Dankov, S. Kolev, T. Koutzarova, “Dielectric and magnetic properties of Sr3Co2Fe24O41 thin hexaferrite samples in the microwave range”, 21th International Summer School on VEIT, 23−27.09.2019, Sozopol, Bulgaria.
22. T. Koutzarova, S. Kolev, B. Georgieva, Ch. Ghelev, K. Krezhov, D.Kovacheva, B. Vertruyen, R. Closset, L.M.Tran, M. Babij, A. Zaleski, “Structural and Magnetic Study of Thick Hexaferrite Films”, 21th International Summer School on VEIT, 23−27.09.2019, Sozopol, Bulgaria.
23. B. Georgieva, S. Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L.M.Tran, M. Babij, A. Zaleski, T. Koutzarova, “Ni-substitution effect on the properties of Ba0.5Sr1.5Zn2-xNixFe12O22 powders”, The Joint European Magnetic Symposia 2019, 26 – 30 August 2019, Uppsala, Sweden.
24. K. Krezhov, T. Koutzarova, S. Kolev, P. Peneva, ”Structure and magnetic properties of nanosized Al substituted barium hexaferrite powders”, 7th International Conference on Radiation in Various Fields of Research, 9-14 June 2019 Herceg Novi, Montenegro.
25. T. Koutzarova, S. Kolev, K. Krezhov, L.M. Tran, M. Babij, A. Mahmoud, R. Closset, B. Vertruyen, F. Boschini, D. Kovacheva, Ch. Ghevel, A. Zaleski, “Synthesis and characterization of nanosized ZnFe2O4 powders obtained by sonochemistry”, 21th International Workshop on Nanoscience&Nanotechnology, 21-22.11.2019, София
26. T. Koutzarova, S. Kolev, K. Krezhov, B. Vertruyen, F. Boschini, R. Closset, A. Mahmoud, L. M. Tran, M. Babij, A. Zaleski, D. Kovacheva, Ch. Ghelev, M. Ptak, ”Low temperature investigation of nanosized BaFe12O19 powders”, 21th International Workshop on Nanoscience&Nanotechnology, 21- 22.11.2019, Sofia, Bulgaria.
27. B. Georgieva, S. Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L. M. Tran, M. Babij, A. Zaleski, “Substitution effect on the properties of Ba0.5Sr1.5Zn2Fe12O22 powders”, 21th International Workshop on Nanoscience&Nanotechnology, 21- 22.11.2019, Sofia, Bulgaria.
28. T. Koutzarova, S. Kolev, K. Krezhov, B. Georgieva, D. Kovacheva, Ch. Ghelev, B. Vertruyen, F. Boschini, A. Mahmoud, L.M. Tran, A. Zaleski, “Study of the structural and magnetic properties of Co-substituted Ba2Mg2Fe12O22 hexaferrites synthesized by sonochemical co-precipitation”, Journee du Departement, Faculty of Science, University of Liege, Belgium, 8 July 2019.
29. B. Georgieva, S. Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, L.M. Tran, M. Babij, A. Zaleski, B. Vertruyen, R. Closset, T. Koutzarova, “Y-type Hexaferrites – New Magneto-Electric Materials”, ICQNN’2019, Symposium on Nanomaterials and Nanotechnologies, 5.09.2019 Sofia.
30. B. Georgieva, K. Krezhov, T. Koutzarova, S. Kolev, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L.M. Tran, A. Zaleski, M. Fabian, E. Svab, “Characterization of Y-type Hexaferrite Ba2Mg2Fe12O22 Powders”, 50th IFF Spring School 2019, “Scattering! Soft, Functional and Quantum Materials”, 10 – 22.03.2019 Julich, Germany.
31. K. Krezhov, T. Malakova, “Half Replacement of Bismuth by Neodymium in Half-Hole Doped Bismuth-Based Manganites Bi0.25Nd0.25X0.5MnO3 (X=Sr, Ca): A Neutron Diffraction Study", VII European Conference on Neutron Scattering - ECNS 2019, 30.06-5.07.2019, Saint Petersburg, Russia.
32. K. Krezhov, “Neutron Scattering Assisted Structural Investigations (Understanding materials - bulk and nano )” International Conference on Oxide and Non-oxide Materials for Optoelectronics and Energy Applications (ICONMO 5) 20 – 23 March 2019, Borovets, Bulgaria.
33. B. Georgieva, S. Kolev, K. Krezhov, Ch. Ghelev, D. Kovacheva, B. Vertruyen, R. Closset, L. M. Tran, M. Babij, A. Zaleski, T. Koutzarova, „Effect of the preparation technique on the structural and magnetic properties of Y-type hexaferrite powders“, European School on Magnetism, 17 – 28 September, 2018, Krakow, Poland.