Structure-phase transformations in LiF powders and crystals irradiated in nuclear reactor and 60Co gamma-source


XRD, SEM-EDS and FTIR were used for studying stable products of nuclear reactions of “branching decay” in LiF exposed to  intensive 1.17 and 1.33 MeV 60Co y-radiation to dose 109 R and mixed neutron+y-fluxes of WWR to fluencies 1017-1018cm-2: 19F9 + y -> 11B5 + 7Li3 + 1H1 or -> 16О8 + 3Т1 and 19F9 + 1n0 -> 20Ne10 or ->210B5 in addition to the known 6Li(n,a)3T. The main part of impact radiation is absorbed in micron subsurface layer, so the following radiation induced structure-phase transformations are highly inhomogeneous: hillocks of LiF-B2O3 and LiBH, LiO2 nanofilm and LiH nanocones are detected on LiF surface. It explains impossibility of annealing LiF-detectors



  1. Hobbs L.W., A.E. Hudges, G. Chassagne. Direct observation of alkali metal colloids in alkali halide crystals. Nature 252 (1974) 383.
  2. Johnson R.A., A.N. Orlov, Physics of Radiation Effects in Crystals. Elsevier Science Publ B.V., 1986. p. 387.
  3. Baldacchini G., Colored LiF: an optical material for all seasons, J. of Luminescence 100 (2002) 333.
  4. Salah N. Nanocrystalline materials for the dosimetry of heavy charged particles: A review. Radiation Physics and Chemistry 80 (2011) 1-10
  5. Binder D. and W.J. Sturm. Equivalence of X-ray lattice parameters and density changes in neutron irradiated LiF. Physical Review 96 (1954) 1519-1522
  6. Seitz F. and J.S. Koehler. Solis State Physics 2 (1956) 90, 443
  7. Smallman R.E. and B.T.M. Willis. An X-ray study of neutron irradiated lithium fluoride. Philosophical Magazine 2 (1957) 1018-1026. DOI:10.1080/14786435708238208
  8. Lambert M., Ch. Mazieres, A. Guinier. Precipitation de lithium dans les monocristaux de fluorure de lithium irradies aux neutrons thermiques. J. Phys. Chem. Solids 18 (1961) 129-138.
  9. Knutson S.D., H.O. Hooper, P.J. Bray. A nuclear magnetic resonance study of decomposition in neutron-irradiated LiF J. Physics Chemistry of Solids, 27 (1966) 147.
  10. Kolontsova E.V., I.V. Telegina, V.L. Zefirova. Effect of irradiation conditions on defect structure of LiF single crystals. In: Radiation effects in solids. Kiev, Naukova dumka, 1977. p. 102-110.
  11. Dubinko V.I., A.A. Turkin, D.I. Vainstein, H.W. den Hartog. Theory of the late stage of radiolysis of alkali halides. J. Nuclear Materials 277 (2000) 184-198.
  12. Izerrouken M., N. Souami, L. Guerbous, S. Djaroum, M. Kadouma, A.Sari, A. Meftah. Li colloids formation study induced by reactor neutrons in LiF single crystals. Nuclear Instruments and Methods B 266 (2008) 2745.
  13. Stoneham A. M. Theory of radiation defects Nuclear Instruments and Methods in Physics Res. A 91 (1994) 1-11.
  14. Siscafus K.E., Kotomin E.A. Radiation Effects in Solids. Amsterdam: Uberuaga Springer B. P., 2007. Ch. 7.
  15. Vijayakumar R., Shivaramu, Ramamurthu, N., Ford M.J. Compton scattering study of electron momentum distribution in lithium fluoride using 662 keV gamma-radiation. Physica B: Condensed matter, 403 (2008) 4309-4313
  16. Mussaeva M.A., E.M. Ibragimova, M.U. Kalanov, M.I. Muminov. Formation of nanodefects in LiF crystals under gamma irradiation. Physics of the Solid State 48 (2006) 2295.
  17. Ibragimova E.M., M.A. Mussaeva, M.U. Kalanov, N.M. Mukhamedshina, V.N. Sandalov. Lithium nanoparticles in lithium fluorite crystals. J. Phys. Conf. Ser. 391 (2012) 012172.
  18. Bryukvina L.I. and E.F. Martynovich. Physics of the Solid State. 54 (2012) 2056.
  19. Friedlander G., J.W. Kennedy,G.S. Macias, J.M. Miller. Nuclear and radiochemistry. New York: J.Willey&Sons 1981
  20. Holder C.F. and R.E. Schaak. Tutorial on Powder X-ray Diffraction for Characterizing Nanoscale Materials. ACS Nano 13 (2019) 7359-7365
  21. Allen L.J., A.J. D’Alfonso, B. Freitag, D.O. Klenov. Chemical mapping at atomic resolution using energy-dispersive X-ray spectroscopy.MRS Bulletin 37 (2012) 47-52
  22. Tscherbul T.V., R.V. Krems. Quantum theory of chemical reactions in the presence of electromagnetic fields. J. Chemical Physics 129(3) (2008) 034112
  23. Mussaeva M.A., E.M. Ibragimova. Electron microscopy and elemental composition of the near-surface layer of electron-irradiated LiF crystals. Technical Physics Letters 45 (2019) 155–158.

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