STUDY OF STRUCTURAL AND SPECTRAL CHARACTERISTICS OF CRYSTAL Y3Al5O12, Al2O3 AND SrTiO3 DOPED BY 3d- OR 4f- IONS

Authors

  • Slavica Maletić University of Belgrade, Faculty of Physics, Studentski trg 12, Belgrade, Serbia
  • Dušan Popović University of Belgrade, Faculty of Physics, Studentski trg 12, Belgrade, Serbia
  • Dragana Cerović University of Belgrade, Faculty of Physics, Studentski trg 12, Belgrade, Serbia
  • Jablan Dojčilović University of Belgrade, Faculty of Physics, Studentski trg 12, Belgrade, Serbia

DOI:

https://doi.org/10.7251/COMEN1602190M

Abstract

The subject of our research is a study of the effects of various treatments on the structural and spectral characteristics of oxides (Y3Al5O12, Al2O3 and SrTiO3) belonging to the group of ionic crystals with a wide energy band gap. We have investigated the dielectric and optical characteristics of single laser crystals of Y3Al5O12 (YAG) doped by ions from the group of iron (3d-), Al2O3 single crystal and SrTiO3 crystals doped by 3d and 4f- ions. Dielectric properties of the investigated single crystals were analyzed using dielectric spectroscopy (80 kHz – 15 MHz) in a wide temperature range (50 – 400 K). The comparison of the temperature dependence of the dielectric permittivity (εr) and dielectric loss (tanδ) at different test frequencies for undoped and doped crystals was performed. The optical properties were studied on the basis of the absorption spectra in the UV-Vis region. The experiment results showed that presence of 3d dopants in YAG crystal caused a displacement of the absorption edge and appearance of characteristic peaks. The differences observed in the absorption spectra were probably the result of the 3d ions incorporation on two possible symmetrically different positionings of aluminum ions –tetrahedrical and octahedrical– in the YAG crystal lattice. The dielectric spectroscopy measurements for samples of SrTiO3 doped by 4f ions showed anomalous behaviors of the dielectric permittivity at temperatures around the temperature of the structural phase transition 105 K.

References

A. Sugimoto, Y. Nobe, K. Yamagishi, Crystal growth and optical characterization of Cr,Ca: Y3Al5O12, Journal of Crystal Growth, Vol. 140 (1994) 349–354.

M. Schubert, T.E. Tiwald, C.M. Herzin-ger, Infrared dielectric anisotropy and phonon modes of sapphire, Phys. Rev. B, Vol. 61 (2000) 8187–8201.

K.Kamaras, K. -L. Barth, F. Keilmann et al.,The low-temperature infrared optical functions of SrTiO3 determined by reflectance spectroscopy and spectroscopic ellipsometry, J. Appl. Phys., Vol. 78 (1995) 1235–1240.

S. Maletic, D. Maletic, I. Petronijevic, J. Dojcilovic and D. M. Popovic, Dielectric and infrared properties of SrTiO3 single crystal doped by 3d (V, Mn, Fe, Ni) and 4f (Nd, Sm, Er) ions, Chinese Physics B, Vol. 23−2 (2013) 026102–6.

K. V. Benthem, C. Els¨asser and R.H. French, Bulk electronic structure of SrTiO3: Experiment and theory, J. Appl. Phys., Vol. 90 (2001) 6156–6164.

Ј. Dojcilovic, N.A. Kulagin, D. Popovic, S. Spasovic, Temperature dependence of the dielectric parameters of nonstoichiometric SrTiO3 single crystals, Crystallography Reports, Vol. 49−3 (2004) 469–475.

S. B. Maletic, D. D. Cerovic, F. S. Marinkovic, J. R. Dojcilovic, Dielectric and optical properties of a poly(ethylene terephthalate) membrane in the temperature interval 150 – 400 K, Journal of Applied Polymer Science, Vol. 132−7 (2015) 42834 (1–6).

Y. Xu and W.Y. Ching, Electronic structure of yttrium aluminum garnet (Y3Al5O12), Phys. Rev B., Vol. 59−16 (1999) 10530–10535.

J. Krupka, K. Derzakowski, M. Tobar, J. Hartnett, R. G. Geyer, Complex permittivity of some ultralow loss dielectric crystals at cryogenic temperatures, Measurement Science and Technology, Vol. 10−5 (1999) 387–392.

R. D. Shannon, M. A. Subramanian, T. H. Allik, Dielectric constants of yttrium and rare‐earth garnets, the polarizability of gallium oxide, and the oxide additivity rule, J. Appl. Phys., Vol. 67 (1990) 3798–3802.

M. Lj. Napijalo, One application of thermodynamics to solid dielectrics, J. Phys. Chem Solids, Vol. 59 (1998) 1251–4.

N. A. Kulagin and J. Dojčilović, Structural and radiation color centers and the dielectric properties of doped yttrium aluminum garnet crystals, Phys Solid State, Vol. 49 (2007) 243–250.

S. Maletic, D. M. Popovic, V. Cubrovic, A. A. Zekic, J. Dojcilovic, Surface and crystalline analysis of aluminum oxide single crystal treated by quasistationary compression plasma flow, Materials Research Bulletin, Vol. 47−4 (2012) 963–966.

S. Maletic, Studying the effects of diffe-rent treatments on the spectral and structural characteristics of the laser crystals YAG, Al2O3 and SrTiO3, (in Serbian), PhD Thesis, Faculty of Physics, University of Belgrade, Belgrade 2011.

M. E. Innocenzi, R.T. Swimm et al, Optical absorption in undoped yttrium aluminum garnet, Journal of Applied Physic, Vol. 68 (1990) 1200–1204.

N. F. Mott, R. W. Gurney, Electronic Processes in Ionic Crystals, Oxford University Press, London 1940.

R. H. French, H. Müllejans, D. J. Jones, Optical Properties of Aluminum Oxide: Determined from Vacuum Ultraviolet and Electron Energy-Loss Spectroscopies, J. Am. Ceram. Soc., Vol. 81−10 (1998) 2549–2557.

Ј. H. Barrett, Dielectric constant in perovskite type crystals, Phys. Rev., Vol. 86−1 (1952) 118.

K. A. M¨uller and H. Burkhard, SrTiO3: An intrinsic quantum paraelectric below 4, Phys. Rev. B, Vol. 19 (1979) 3593–3602.

N. Kulagin and J. Dojcilovic, Strontium titanate: valency of Ti+ n and dielectrical properties of doped single crystals, Physica B, Vol. 269 (1999) 49–59.

S.Maletic, N. Paunovic, D. Popovic and J. Dojcilovic, Effects of Mn and Nd Doping on Polarization Mehanisms of SrTiO3 Single Crystal, Proceeding of the 7th International Conference of the Balkan Physical Union, Alexandroupolis, Greece, 2009, 267–271.

S. Maletic, D. Popovic, J. Dojcilovic, Dielectric measurements, Raman scattering and surface studies of Sm-doped SrTiO3 single crystal, Journal of Alloys and Compounds, 496 (1 – 2), (2010), 388 – 392.

F.S. Galasso, Structure, Properties and Preparation of Perovskite-Type Compounds (Oxford: Pergamon) Oxford 1969, 3.

J. Dojcilovic, N. Kulagin, D.Popovic and S.Spasovic, Temperature Dependence of Dielectric Parameters of Nonstoichiometric SrTiO3 Single Crystals, Crystallography Reports, Vol. 49−3 (2004) 469–475.

T.Tsur, D. Dunbar, C. A. Randall, Crystal and defect chemistry of rare earth cations in BaTiO3, J. Electroceram, Vol. 7−1 (2001) 25–34.

Downloads

Published

2017-12-29