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Juhendajad: P rof., füüs-mat. doktor. A. Luštšik Vanemteadur, füüs-mat. kand. – J . Vassiltšenko

Luminestsentskaitse Frenkeli defektide tekke vastu NaCl ja MgO kristallide kiiritamisel elektronidega, VUV-kiirgusega ja suure energiaga ioonidega. Loodus- ja tehnoloogiateaduskond 4 .a doktorant Jevgeni Šablonin. Juhendajad: P rof., füüs-mat. doktor. A. Luštšik

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Juhendajad: P rof., füüs-mat. doktor. A. Luštšik Vanemteadur, füüs-mat. kand. – J . Vassiltšenko

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  1. Luminestsentskaitse Frenkeli defektide tekke vastu NaCl ja MgO kristallide kiiritamisel elektronidega, VUV-kiirgusega ja suure energiaga ioonidega . Loodus- ja tehnoloogiateaduskond 4.a doktorant Jevgeni Šablonin Juhendajad: Prof., füüs-mat. doktor. A. Luštšik Vanemteadur, füüs-mat. kand. – J. Vassiltšenko 2012

  2. Sisukord • Eesmärgid ja tähtsamad tulemused • Publikatsioonid, konverentsid, õppeained • Plaanid

  3. Eesmärgid • Võrrelda kiiritamisefekte, mis esinevad erineva elektroonsete ergastuste (EE) tihedusega kiirguste mõjul NaCl ja MgO kristallides ja pulbrites erinevate lisandtsentrite juuresolekul. • Eraldada defekte, mis on stabiilsed kõrgete temperatuurideni (600 – 800 K) ja on tekitatud suure ja ülisuure EE tiheduse põhjustavate ioniseerivate kiirguste mõjul. • Uurida lisandtsentrite ja deformatsiooniliste defektide mõju kiiritusdefektide tekkimise efektiivsusele kuumadel e-h rekombinatsioonidel suurte EE tiheduste juures

  4. Objektid • Sarnasus: • Sama kristallvõre tüüp • Lähedased ioonraadiused NaCl: 1,02 ja 1,81 Å MgO: 0,72 ja 1,4 Å • Erinevus: • Ioonide laengud • NaCl-s augud ja eksitonid autolokaliseeruvad, MgO-s elektronid, augud ja eksitonid ei autolokaliseeru • Kiirguskindlus @RT NaCl: EFD < Eeo . MgO: EFD >> Eg

  5. Kasutatud analüüsimeetodid • Luminestsentsspektrite mõõtmine (1,4-36 eV) • Optilise neeldumise mõõtmised (1,4-6,5 eV ) • Termostimuleeritud luminestsentsi mõõtmine (5-823 K)

  6. Tähtsamad tulemused

  7. NaCl: kiirguskindlam LHe temperatuuril Jahtumisel alla 100 K väheneb stabiilsete Frenkeli defektide tekitamise efektiivsus: EFD > Eeo Defektide teke efektiivsus kasvab järsult energiatel, mis tekitavad kuumaid e-h paare.

  8. NaCl: teised tulemused e-h paaride energia on tähtis ka toatemperatuuril: erinevad protsessid Dopeerimine luminestseerivate lisandioonidega (Br-, Ag+, Tl+) viib elektronide energia hajumisele nendel ioonidel, vähenedes defektide tekkimise tõenäosust.

  9. MgO: bivakantsid (va2+vc2-) Võivad lõksustada kas augu või elektroni, põhjustades iseloomulikke kiirgusi, mille intensiivsus kasvab deformatsiooniga. (va2+e-)vc2-+ h+ va2+vc2-+ 2,9 eV va2+(vc2-h+)+ e- va2+vc2-+ 5,2 eV

  10. MgO: bivakantsid (va2+vc2-) n0 238U Näitavad kristalli deformatsiooni raskete ioonidega ja neutronitega kiiritamisel.

  11. MgO: kahjulikud lisandid Be2+ja Ca2+ ioonid [hBe]+ ja [hCa]+lõksustatud auk-tsentridsuure efektiivse ristlõiguga kuumade elektronidega rekombinatsiooniks

  12. tetragonal rhombic MgO:Cr3+

  13. N0 N1 R0 R1 MgO:Cr3+: CCD spectra MgO:Cr3+ (850 ppm), X-ray 2 h (50 kV, 15 mA), emission for excitation 6.25 eV (198.37 nm), CCD 0.1, ARC 300/500, 5 x 20 s, 800/150 nm (1.55/0.3 eV), GG420, Quartz, 127,8 mA, T = 7.4 K, DESY 3.03.2012

  14. MgO:Cr3+ MgO:Cr3+ (850 ppm), X-ray 2 h (50 kV, 15 mA), excitation spectra for Cr-emission region peaks, CCD 0.1, ARC 300/500, 5 x 20 s, 800/150 nm (1.7/0.3 eV), T = 7.4 K, DESY.

  15. Publikatsioonid S. Dolgov, A. Kotlov, I. Kudryavtseva, A. Lushchik, V. Nagirnyi, E. Shablonin, E. Vasil'chenko, "Creation spectra of F centres by 7-40 eV photons in NaCl crystals at 300 or 12 K," In: MAX-LAB Activity Report 2008, National Laboratory, Lund, Sweden, pp. 96-97, 2009. A. Lushchik, Ch. Lushchik, T. Kärner, V. Nagirnyi, E. Shablonin, E. Vasil'chenko, "Impact and nonimpact creation mechanisms of radiation defects in ionic crystals," Izv.VUZOV, Fizika(Russian Physics Journal), 52, N 8/2, pp, 95-100, 2009. [А.Лущик, Ч.Лущик, Т.Кярнер, В.Нагирный, Е.Васильченко, "Ударные и неударные процессы создания радиационныхдефектов в ионных кристаллах," Изв. ВУЗОВ, Физика, т. 52, N 8/2, cc. 95-100, 2009] 1.2 A. Baimakhanuly, E. Vasil′chenko, Ju. Maksimov, L. Pung, E. Shablonin, "The role of electronic excitations in the creation of nano-size defects in KCl," Izv.VUZOV, Fizika (Russian Physics Journal) 52, N 8/2, pp, 18-21, 2009. A. Lushchik, V. Nagirnyi, E. Shablonin, O. Sidletskiy, B. Toxanbayev and A. Zhunusbekov "Luminescence of cation excitons in Gd2SiO5 crystals," In: HASYLAB Activity Report 2009, Part I, DESY, Hamburg, Germany (2009). A. Lushchik, Ch. Lushchik, T. Kärner, P. Liblik, V. Nagirnyi, E. Shablonin, A. Shugai, E. Vasil'chenko, "Franck-Hertz effect in cathodo- and photoluminescence of wide-gap materials", Radiat. Meas., 45 (3-6), 268-272, 2010. 1.1. A. Lushchik, S. Dolgov, I. Kudryavtseva, T. Kärner, F. Savikhin, E. Vasil'chenko, E. Shablonin, A. Shugai, "Attenuation of radiation damage in dielectric and composite materials of interest for a fusion reactor," Fusion Yearbook Association Euratom-Tekes,Annual Report 2009, VTT Publications 7389, Helsinki, Finland, pp. 69-72 (2010). E. Feldbach, A. Lushchik, Ch. Lushchik, V. Nagirnyj, E.Shablonin, S. Vielhauer, "Creation of long-lived Frenkel defects via hot electron-hole recombination in pure NaCl crystals at 12 K," in: MAX-LAB Activity Report 2010, National Laboratory, Lund, Sweden, pp. 462-463, 2010.

  16. Publikatsioonid S. Dolgov, T. Kärner, A. Lushchik, E. Shablonin, "Recombination of conduction electrons with trapped-hole centres in MgO:Be and MgO:Ca single crystals", Bulletin of Karaganda University, Phys. Ser. 1(61), pp. 15-20, 2011. 1.3 ISSN 0142-0843 [Вестник Карагандинского госуниверситета, Республики Казахстан] in English. S. Dolgov, T. Kärner, A. Lushchik, A. Maaroos, S. Nakonechnyi, Е. Shablonin "Trapped-hole centers in MgO single crystals," Phys. Solid State, 53 (6), pp. 1244-1252, 2011 [С.А. Долгов, Т. Кярнер, А. Лущик, А. Маароос, С. Наконечный, Е. Шаблонин, Локализованные дырки в монокристаллах MgO, ФТТ, т. 53 (6), сс. 1179-1187, 2011, 1.1. A. Lushchik, Ch. Lushchik, I. Kudryavtseva, A. Maaroos, F. Savikhin, Е. Shablonin, E. Vasil'chenko, "Low-temperature investigation of electronic excitations in wide-gap materials doped with RE3+ and Cr3+ impurity ions", Optics and Spectroscopy, 111 (3) pp. 434-4402011. [А. Лущик, Ч. Лущик, И. Кудрявцева, А. Маароос, Ф. Савихин, Е. Шаблонин, Е. Васильченко, "Низкотемпературное исследование электронных возбуждений в широкощелевых материалах, легированных ионами RE3+ или Cr3+," Оптика и спектроскопия, т. 111 (3), сс. 466-472, 2011] A. Lushchik, V. Nagirnyj, K. Schwartz, E. Shablonin, A. Shugai, "Electronic Excitations and Defect Creation in Lu3Al5O12 Crystals Irradiated with Swift Heavy Ions," In: HASYLAB Activity Report 2011, DESY, Hamburg, Germany, 2 pages in online version. A. Lushchik, Ch. Lushchik, K. Schwartz, F. Savikhin, E. Shablonin, A. Shugai, E. Vasil'chenko," Creation and clustering of Frenkel defects at high density of electronic excitations in wide-gap materials, " Nucl. Instr. and Meth. B, 277, 40-44, 2012. A. Lushchik, T. Kärner, Ch. Lushchik, K. Schwartz, F. Savikhin, E. Shablonin, A. Shugai, E. Vasil'chenko, "Electronic excitations to defect creation in wide-gap MgO and Lu3Al5O12 crystals irradiated with swift heavy ions," Nucl. Instr. and Meth. B, doi:10.1016/jnimb.2011.11.016. A. Lushchik, Ch. Lushchik, V. Nagirnyj, S. Pazylbek, O. Sidletskiy, K. Schwartz, E. Shablonin, A. Shugai, E. Vasil'chenko, "On the nonimpact mechanisms of radiation damage and prospects of their suppression in complex metal oxides," Phys. Status Solidi C, (to be submitted).

  17. Konverentsid (ettekandja) (*) E. Shablonin, T. Kärner, P. Liblik, A. Lushchik, A. Maaroos, V. Nagirnyi, F. Savikhin, E. Vasil'chenko, "Electron and hole processes in MgO crystals,"International Baltic Sea Region conference "Functional materials and nanotechnologies," Riga, March 31- April 3, 2009, Po-23 (poster).  (*) E. Shablonin, “Luminescent protection against the creation of Frenkel defects at the irradiation of NaCl and MgO single crystals by VUV radiation, electrons and swift ions”, TÜ ja TTÜ doktorikooli “Funktsionaalsed materjalid ja tehnoloogiad” esimene teaduskonverents, Tartu, Estonia, 25.-26.02.2010, (poster). (*) E. Shablonin, T. Kärner, A. Lushchik, K. Schwartz, E. Vasil'chenko, "Impact and nonimpact creation of defects in MgO crystals under swift-heavy-ion-irradiation," Abstr. 11th Europhysical Conference on Defects in Insulating Materials (EURODIM 2010, Pecs, Hungary, July 12-16, 2010), (poster). (*) E. Shablonin, “Radiation-induced defects in MgO crystals under swift-heavy-Ion-irradiation”, TÜ ja TTÜ doktorikooli “Funktsionaalsed materjalid ja tehnoloogiad” teine teaduskonverents, Tallinn, Estonia, 3–4.03.2011, (poster). (*) E. Shablonin, “Electronic Excitations and Defect Creation in Wide-gap MgO Single Crystals Irradiated with Swift Heavy Ions”, TÜ ja TTÜ doktorikooli “Funktsionaalsed materjalid ja tehnoloogiad” kolmas teaduskonverents, Tartu, Estonia, 29.02-1.03.2012, (poster).

  18. Konverentsid (kaasautor) (*) A.Baimakhanov, A.Kotlov, I.Kudryavtseva, A.Lushchik, V.Nagirnyi, E.Shablonin, E.Vasil'chenko, "Peculiarities of radiative and non-radiative decay channels of intrinsic electronic excitations in NaCl," International Baltic Sea Region conference "Functional materials and nanotechnologies," Riga, April 1-4, 2008, Po-10 (poster). (*) A. Lushchik, Ch. Lushchik, T. Kärner, P. Liblik, V. Nagirnyi, E. Shablonin, A. Shugai, E. Vasil'chenko, "Franck-Hertz effect in cathodo- and photoluminescence of wide-gap materials, 7th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation, Krakow, Poland, July 12-17, 2009, Mo-7 (invited lecture). (*) A. Lushchik, Ch. Lushchik, T. Kärner, V. Nagirnyi, E. Shablonin, and E. Vasil'chenko, "Impact and nonimpact creation mechanisms of radiation defects in ionic crystals," 14th International Conference on Radiation Physics and Chemistry of Inorganic Materials (RPC-14),Astana, Kazakhstan, October 6-10, 2009 (invited lecture). (*) A. Baimakhanuly, E. Vasil′chenko, Ju. Maksimov, L. Pung, E. Shablonin, "The role of electronic excitations in the creation of nano-size defects in KCl,"14th International Conference on Radiation Physics and Chemistry of Inorganic Materials (RPC-14), Astana, Kazakhstan, October 6-10, 2009 (oral). (*) A. Lushchik, A. Baimakhanuly, A. Kotlov, V. Nagirnyi, E. Shablonin, E. Vasil'chenko, "Defect creation via hot carriers recombination or decay of cation excitons in NaCl and MgO at 6-12 K," Abstr. 11th Europhysical Conference on Defects in Insulating Materials (EURODIM 2010, Pecs, Hungary, July 12-16, 2010), (oral talk). (*) Ch. Lushchik, I. Kudryavtseva, T. Kärner, A. Lushchik, F. Savikhin, E. Shablonin, E. Vasil'chenko, "Low-temperature study of intrinsic electronic excitations in wide-gap materials using luminescent RE3+ and Cr3+ impurity ions", XIV International Feofilov Symposium on Spectroscopy of Crystals Doped with Rare Earth and Transition Metal Ions, St. Petersburg, October 18-21, 2010 (oral talk). (*) A. Lushchik, Ch. Lushchik, K. Schwartz, F. Savikhin, E. Shablonin, A. Shugai, E. Vasil'chenko," Creation and clustering of Frenkel defects at high density of electronic excitations in wide-gap materials," EMRS 2011 Spring Meeting, Symposium L "Basic research on ionic-covalent materials for nuclear applications", Nice, France May 9-13, 2011 L3-5 (oral talk). (*) A. Lushchik, Ch. Lushchik, K. Schwartz, F. Savikhin, E. Shablonin, A. Shugai, E. Vasil'chenko," Contribution of electronic excitations to defect creation in wide-gap metal oxides irradiated with swift heavy ions or fast electrons," 16th International Conference on Radiation Effects in Insulators (REI-2011),Beijing, China, August 1419, 2011, I-1, Abstr. p. 34 (invited lecture).

  19. Konverentsid (kaasautor) (Kaasautor) A. Luschik, Ch. Lushchik, V. Nagirnyj, S. Pazylbek, O. Sidletskiy, K. Schwartz, E. Shablonin, A. Shugai, E. Vasil'chenko,"On the nonimpact mechanisms of radiation damage and prospects of their suppression in complex metal oxides," International Conference on Defects in Insulating Materials (ICDIM 2012, Santa Fe, USA, June 25-29, 2012), (oral talk)

  20. Ained Doktoriseminar (8. osa) (LOFY.00.004), 3 EAP Sissejuhatus elektronide paramagnetilisse resonantsi ja selle meetodi rakendamine materjaliteaduses (LOFY.02.053), 1 EAP

  21. Plaanid • Eelnevate aastate jooksul saadud eksperimentaalsete tulemuste üldistamine. • Dissertatsiooni kirjutamine, vormistamine ja kaitsmine. Dissertatsiooni esitamine on planeeritud selle aasta augusti lõpule – septembri algusele.

  22. Tänan tähelepanu eest!

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