Journal of Physical Studies 26(4), Article 4701 [6 pages] (2022)
DOI: https://doi.org/10.30970/jps.26.4701

X-RAY SPECTROSCOPIC PROPERTIES AND ELECTRONIC STRUCTURE OF Ca3Ga2Ge4O14

I. D. Shcherba1 , L. V. Kostyk1 , L. V. Bekenov2 , M. Rudko1 , D. Uskoković3 , H. Noga4 , R. M. Bilyk1 , B. M. Yatcyk5, V. A. Denys1

1Ivan Franko National University of Lviv, 6/8, Kyrylo & Mefodiy St., Lviv, UA–79005 Ukraine
2G. V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, 36, Academician Vernadsky Boul., Kyiv, UA–03142, Ukraine
3Institute of Technical Sciences of SASA, 35/IV, Knez Mihailova, PO Box 37711000 Belgrade, Serbia
4Institute of Technology, University of Pedagogy, 2, Podchorazych, 30–084 Krakow, Poland
5Lviv National University of Veterinary Medicine and Biotechnologies, 50, Pekarska St., Lviv, UA–79000, Ukraine

Received 11 April 2022; in final form 10 August 2022; accepted 21 September 2022; published online 19 December 2022

We have obtained X-ray emission spectra of Ga and Ge in Ca$_3$Ga$_2$Ge$_4$O$_{14}$, X-ray emission O$K{α}$-spectra in Ca$_3$Ga$_2$Ge$_4$O$_{14}$, Ca$_3$Ga$_2$Ge$_4$O$_{14} + {\rm Ce} 3\%$, and Ca$_3$Ga$_2$Ge$_3$O$_{12} + {\rm Eu} 4\%$ and X-ray photoelectron spectra in Ca$_3$Ga$_2$Ge$_4$O$_{14}$ . Our X-ray spectral studies of the Ca$_3$Ga$_2$Ge$_4$O$_{14}$ gallogermanate have shown that the top of the valence band near the Fermi level is formed mainly by \emph{p} states of gallium and germanium as well as \emph{p} states of oxygen, whose intensity is sufficiently low. The middle of the valence band is formed by gallium 3\emph{d} states with oxygen 2\emph{s} states lying below them. These states are hybridized with 4\emph{p} states of gallium and germanium because of which there are $K{β”}$-satellites in the $K{β}_{2}$-subbands of gallium and germanium. The bottom of the valence band is formed by 3\emph{d} states of germanium, whose contribution to chemical bonding is insignificant. The X-ray emission bands of Ga and Ge in Ca$_3$Ga$_2$Ge$_4$O$_{14}$ and the photoelectron spectrum of the valence electrons of Ca$_3$Ga$_2$Ge$_4$O$_{14}$ are in good agreement. The O$K{α}$-band changes its fine structure only slightly upon doping Ca$_3$Ga$_2$Ge$_4$O$_{14}$ with Ce or Eu. The investigations of intrinsic luminescence under X-rays excitation of Ca$_3$Ga$_2$Ge$_4$O$_{14}$ gallogermanate are presented.

Key words: X-ray emission spectra, Ca-gallogermanate, electronic structure, luminescence

Full text

References
  1. E. L Belokoneva, N. V Belov, Dokl. Akad. Nauk SSSR 260, 1363 (1981).
  2. A. A. Kaminskii, Sov. Phys. Usp. 27, 548 (1984);
    Crossref
  3. A. Dudka, B. V. Mill', Crystallogr. Rep. 58, 593 (2013);
    Crossref
  4. A. Nosenko, R. Leshchuk, V. Kravchishin, J. Phys., IV 04, C4-455 (1994);
    Crossref
  5. M. F. Dubovik, Inorg. Mater. 28, 1999 (1992).
  6. Ya. Shopa, N. Ftomyn, Opt. Appl. 43, 217 (2013);
    Crossref
  7. X. Zhang et al., Opt. Mater. Express 5, 977 (2015);
    Crossref
  8. Z. B. Perekalina, T. F. Veremeichik, K. A. Kaldybaev, A. D. Tynaev, Crystallogr. Rep. 45, 304 (2000);
    Crossref
  9. J.-P. R. Wells, T. P. J. Han, G. Mcconnell, Radiat. Eff. Defects Solids 149, 329 (1999);
    Crossref
  10. V. Burkov, L. Alyabyeva, B. Mill, V. Kotov, Opt. Mater. 79, 317 (2018);
    Crossref
  11. A. A. Kaminskii et al., Phys. Status Solidi 86, 345 (1984);
    Crossref
  12. E. L. Belokoneva, M. A. Simonov, A.V. Butashin, B. V. Mill, N. V. Belov, Sov. Phys. Dokl. 25, 954 (1980).
  13. N. Araki et al., J. Eur. Ceram. Soc. 27, 4099 (2007);
    Crossref
  14. I. D. Shcherba, High-Energy Spectroscopy of Compounds (Ivan Franko National Universuty of Lviv, 2018).
  15. I. D. Shcherba et al., J. Alloys Compd. 179, 137 (1992);
    Crossref
  16. V. Murk, A. Kuznetsov, B. Namozov, K. Izmailov, Nucl. Instrum. Meth. 91, 327 (1994);
    Crossref
  17. Yu. Zorenko et al., Rad. Measur. 38, 677 (2004);
    Crossref
  18. A. E. Nosenko, L. V. Kostyk, Radiat. Prot. Dosim. 65, 127 (1996);
    Crossref
  19. B. Padlyak, Ukr. J. Phys. Opt. 8, 235 (2007);
    Crossref
  20. L. Kostyk et al., Acta Phys. Pol. 133, 943 (2018);
    Crossref
  21. A. E. Nosenko, R. Ye. Leshchuk, B. V. Padlyak, A. A. Sel'skii, Phys. Solid State 39, 938 (1997);
    Crossref