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Chin. Phys. B, 2014, Vol. 23(2): 026102    DOI: 10.1088/1674-1056/23/2/026102

Dielectric and infrared properties of SrTiO3 single crystal doped by 3d (V, Mn, Fe, Ni) and 4f (Nd, Sm, Er) ions

S. Maletica, D. Maleticb, I. Petronijevica, J. Dojcilovica, D. M. Popovica
a Faculty of Physics, University of Belgrade, Studentski trg 12–14, 11000 Belgrade, Serbia;
b Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
Abstract  In this study, the effects of doping by 3d (V, Mn, Fe, Ni) and 4f (Nd, Sm, Er) ions on dielectric and infrared properties of SrTiO3 (STO) single crystals are investigated. It is well known that doping of the SrTiO3 can change the dielectric properties of the STO from an insulator to an n-type semiconductor, and even to a metallic conductor. Dielectric and infrared (IR) properties of the undoped STO and doped STO single crystals are analyzed using dielectric spectroscopy (80 kHz–5 MHz), transmission (200 cm-1–4000 cm-1), and reflection spectroscopy (50 cm-1–2000 cm-1). It is found that doping by the 3d ions reduces the value of dielectric permittivity, but the trend of temperature dependence of the dielectric permittivity remains almost unchanged. On the other hand, dielectric spectroscopy measurements for samples doped by 4f ions show the anomalous behaviors of the dielectric permittivity at temperatures around the temperature of the structural phase transition. There are two fractures of temperature dependences of inverse dielectric permittivity εr-1(T). Transmittance spectroscopy measurements show that there are differences in the shape of the spectrum in the mid-IR region between the undoped STO and the one doped by 4f ions. The differences in the reflectance spectrum between the STO:Nd and STO are analyzed in detail.
Keywords:  doping      dielectric properties      phase transitions      infrared spectroscopy  
Received:  07 March 2013      Revised:  09 July 2013      Published:  12 December 2013
PACS:  61.72.S- (Impurities in crystals)  
  63.20.-e (Phonons in crystal lattices)  
  77.22.Ch (Permittivity (dielectric function))  
  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
Fund: Project supported by the Science Fund from the Ministry of Education and Science of the Republic of Serbia (Grant No. 171029).
Corresponding Authors:  S. Maletic     E-mail:
About author:  61.72.S-; 63.20.-e; 77.22.Ch; 78.20.Ci

Cite this article: 

S. Maletic, D. Maletic, I. Petronijevic, J. Dojcilovic, D. M. Popovic Dielectric and infrared properties of SrTiO3 single crystal doped by 3d (V, Mn, Fe, Ni) and 4f (Nd, Sm, Er) ions 2014 Chin. Phys. B 23 026102

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