@conference{
author = "Vukašinović, Jelena and Počuča-Nešić, Milica and Luković Golić, Danijela and Savic, Slavica and Branković, Zorica and Tasić, Nikola and Dapčević, Aleksandra and Bernik, Slavko and Kocen, Matej and Branković, Goran",
year = "2018",
abstract = "Perovskite-type materials are widely important class of materials due to their
interesting physical properties, such as superconductivity, ferromagnetism,
ferroelectricity, piezoelectricity, and many others [1]. Barium stannate (BaSnO3) is
crystalizing in an ideal cubic structure, and has good chemical and thermal stability
at high temperatures up to 1200 °C. Undoped BaSnO3 is an n-type semiconductor
with a band gap of ~3.1 eV [1]. BaSnO3 finds application as dielectric ceramic
material, transparent conducting oxide (TCO), resistor, photocatalyst, photoanode
material, gas sensor for many gases, protonic conductor. Doping with antimony (Sb)
can improve the electrical conductivity and enhance density during sintering [1-4].
In this work samples of BaSn1-xSbxO3 (x = 0.04, 0.06, 0.08, 0.1) were prepared by
mechanochemically assisted solid state method. Precursor powders BaCO3, SnO2
and Sb2O3 were mechanochemically activated in isopropanol for 8h. After drying
prepared powders were calcined at 900 °C for 4h in air. Calcined powder were
mounted into a carbon die and subsequently sintered by spark plasma sintering (SPS)
at 1200 °C for 5 minutes. Structural properties of the obtained ceramic samples of
(BaSn1-xSbxO3) were completely characterized by X-ray diffraction (XRD), scanning
electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and
atomic force microscopy (AFM). Electrical properties of the ceramic BaSn1-xSbxO3
samples were determined by measuring the current-voltage characteristics at room
temperature and elevated temperatures in different mediums (air, silicon oil). The XRD analysis showed the formation of the cubic perovskite BaSnO3 as a major phase
and Ba2SnO4 as a secondary phase. The content of tetragonal secondary phase of
Ba2SnO4 was approximately the same in all samples. This confirmed that presence
of Sb did not influence the forming of Ba2SnO4. Ionic radius of Sb3+ (0.076 nm) is
larger than ionic radius of Sn4+ (0.069 nm), and it incorporation by lattice leads to
the increase of lattice parameter [4]. The cubic lattice parameter a was estimated to
be 0.41287(9), 0.41301(9), 0.41321(9) and 0.41302(4) nm for x =0.04, 0.06, 0.08 and
0.1, respectively. The relative densities were 95.2 %, 84.2 %, 85.9 % and 79.2 %
for x =0.04, 0.06, 0.08 and 0.1, respectively The SEM images of the fractured
surfaces of the obtained ceramics revealed that all samples were well-densified,
with the trend of reducing a grain size with increasing of Sb concentration. The
AFM images showed the existence of various particles shapes, with the particle
size of around 36 nm.
References:
[1] M Hiroshi et al, Chemistry of Materials 25 (19) (2013), 3858.
[2] Y Masahiro et al, Materials Science and Engineering B 173 (2010), 29.
[3] L Wenzhong et al, Sensors and Actuators 80 (2000), 35.
[4] Y Daisuke et al, Materials Science and Engineering B 173 (2010), 33.
[5] The authors would like to acknowledge the financial support of the Ministry of
Education, Science and Technological Development of the Republic of Serbia,
project III 45007.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "1st International Conference: „Electron Microscopy of Nanostructures“, ELMINA, 2018 Conference, August 27-29, 2018, Belgrade, Serbia",
title = "Improvement of density and influence of Sb doping on structural properties of perovskite BaSnO3",
pages = "167-166",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_2035"
}
