The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics doped with Al3+, B3+, Mg2+
Authors
Luković Golić, Danijela
Vukašinović, Jelena

Ribić, Vesna
Kocen, Matej
Podlogar, Matejka
Dapčević, Aleksandra
Branković, Goran

Branković, Zorica

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Zinc oxide (ZnO) is a versatile functional material, widely employed in industry
and technology as varistor ceramics, transparent conducting films, surface acoustic
wave resonators etc. ZnO-based conductive ceramics, attractive for various
applications, should have low electrical resistivity and good linearity. The n-type
conductivity of wide band gap (3.37 eV) ZnO semiconductor could be enhanced by
multiple doping with trivalent metals (B3+, Al3+, Ga3+, In3+), as shallow donors. The
intrinsic defects, zinc vacancies and interstitial oxygen, exist in the grain boundaries
of n-type ZnO ceramics as localized acceptor states. These states attract charge
carriers, creating a depletion region around the grain boundaries and energy
potential barrier, which hinder the motion of the electrons [1]. In this work, zinc
oxide ceramics doped with Al3+, B3+ and Mg2+ was prepared using solid-state
reaction technique from ZnO powder obtained in solvothermal synthesis and Al2O3,
MgO and B2O...3 (H3BO3) commercial powders. Al2O3 was used as a donor dopant to
increase the carrier concentration, B2O3 was added to enhance densification and
grain growth, and MgO – to decrease the thermal conductivity [2,3]. The pressed
ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) pellets were sintered by conventional
(CS) and spark plasma (SPS) method. The ceramic samples were analyzed by X-ray
diffraction (XRD), scanning electron microscopy (SEM), transmission electron
microscopy (TEM), UV-Vis spectroscopy and current-voltage (I–U) measurements.
The correlation between the sintering processing, microstructure and electrical
properties of multiple doped ZnO-based ceramics was investigated. The electrical
performances of ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) ceramics were
strongly dependent on composition and microstructure (density, grain size,
segregation of secondary phase in grain boundaries). The electrical resistivity of SPS
sample was an order of magnitude lower than electrical resistivity of CS sample and
it showed almost linear I-U characteristics in temperature range of (25–150) C.
1. T.K. Gupta, W.G. Carlson, J. Mater. Sci., 20 (1985) 3487
2. T. Tian, L. Cheng, J. Xing, L. Zheng, Z. Man, D. Hu, S. Bernik, J. Zeng, J. Yang, Y.
Liu, G. Li, Mater. Design, 132 (2017) 479
3. B. Yuksel, T. O. Ozkan, Mater. Sci. – Poland, 33 (2015) 220
Keywords:
Conductive ceramics / Zinc oxide / Spark plasma sintering / Linear I-U characteristicSource:
5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia, 2019, 134-135Publisher:
- University of Belgrade, Institute for Multidisciplinary Research
Funding / projects:
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200053 (University of Belgrade, Institute for Multidisciplinary Research) (RS-200053)
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Institution/Community
Institut za multidisciplinarna istraživanjaTY - CONF AU - Luković Golić, Danijela AU - Vukašinović, Jelena AU - Ribić, Vesna AU - Kocen, Matej AU - Podlogar, Matejka AU - Dapčević, Aleksandra AU - Branković, Goran AU - Branković, Zorica PY - 2019 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2036 AB - Zinc oxide (ZnO) is a versatile functional material, widely employed in industry and technology as varistor ceramics, transparent conducting films, surface acoustic wave resonators etc. ZnO-based conductive ceramics, attractive for various applications, should have low electrical resistivity and good linearity. The n-type conductivity of wide band gap (3.37 eV) ZnO semiconductor could be enhanced by multiple doping with trivalent metals (B3+, Al3+, Ga3+, In3+), as shallow donors. The intrinsic defects, zinc vacancies and interstitial oxygen, exist in the grain boundaries of n-type ZnO ceramics as localized acceptor states. These states attract charge carriers, creating a depletion region around the grain boundaries and energy potential barrier, which hinder the motion of the electrons [1]. In this work, zinc oxide ceramics doped with Al3+, B3+ and Mg2+ was prepared using solid-state reaction technique from ZnO powder obtained in solvothermal synthesis and Al2O3, MgO and B2O3 (H3BO3) commercial powders. Al2O3 was used as a donor dopant to increase the carrier concentration, B2O3 was added to enhance densification and grain growth, and MgO – to decrease the thermal conductivity [2,3]. The pressed ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) pellets were sintered by conventional (CS) and spark plasma (SPS) method. The ceramic samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis spectroscopy and current-voltage (I–U) measurements. The correlation between the sintering processing, microstructure and electrical properties of multiple doped ZnO-based ceramics was investigated. The electrical performances of ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) ceramics were strongly dependent on composition and microstructure (density, grain size, segregation of secondary phase in grain boundaries). The electrical resistivity of SPS sample was an order of magnitude lower than electrical resistivity of CS sample and it showed almost linear I-U characteristics in temperature range of (25–150) C. 1. T.K. Gupta, W.G. Carlson, J. Mater. Sci., 20 (1985) 3487 2. T. Tian, L. Cheng, J. Xing, L. Zheng, Z. Man, D. Hu, S. Bernik, J. Zeng, J. Yang, Y. Liu, G. Li, Mater. Design, 132 (2017) 479 3. B. Yuksel, T. O. Ozkan, Mater. Sci. – Poland, 33 (2015) 220 PB - University of Belgrade, Institute for Multidisciplinary Research C3 - 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia T1 - The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics doped with Al3+, B3+, Mg2+ EP - 135 SP - 134 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2036 ER -
@conference{ author = "Luković Golić, Danijela and Vukašinović, Jelena and Ribić, Vesna and Kocen, Matej and Podlogar, Matejka and Dapčević, Aleksandra and Branković, Goran and Branković, Zorica", year = "2019", abstract = "Zinc oxide (ZnO) is a versatile functional material, widely employed in industry and technology as varistor ceramics, transparent conducting films, surface acoustic wave resonators etc. ZnO-based conductive ceramics, attractive for various applications, should have low electrical resistivity and good linearity. The n-type conductivity of wide band gap (3.37 eV) ZnO semiconductor could be enhanced by multiple doping with trivalent metals (B3+, Al3+, Ga3+, In3+), as shallow donors. The intrinsic defects, zinc vacancies and interstitial oxygen, exist in the grain boundaries of n-type ZnO ceramics as localized acceptor states. These states attract charge carriers, creating a depletion region around the grain boundaries and energy potential barrier, which hinder the motion of the electrons [1]. In this work, zinc oxide ceramics doped with Al3+, B3+ and Mg2+ was prepared using solid-state reaction technique from ZnO powder obtained in solvothermal synthesis and Al2O3, MgO and B2O3 (H3BO3) commercial powders. Al2O3 was used as a donor dopant to increase the carrier concentration, B2O3 was added to enhance densification and grain growth, and MgO – to decrease the thermal conductivity [2,3]. The pressed ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) pellets were sintered by conventional (CS) and spark plasma (SPS) method. The ceramic samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis spectroscopy and current-voltage (I–U) measurements. The correlation between the sintering processing, microstructure and electrical properties of multiple doped ZnO-based ceramics was investigated. The electrical performances of ZnO (0.25 % Al2O3, 0.5 % B2O3, 1 % MgO) ceramics were strongly dependent on composition and microstructure (density, grain size, segregation of secondary phase in grain boundaries). The electrical resistivity of SPS sample was an order of magnitude lower than electrical resistivity of CS sample and it showed almost linear I-U characteristics in temperature range of (25–150) C. 1. T.K. Gupta, W.G. Carlson, J. Mater. Sci., 20 (1985) 3487 2. T. Tian, L. Cheng, J. Xing, L. Zheng, Z. Man, D. Hu, S. Bernik, J. Zeng, J. Yang, Y. Liu, G. Li, Mater. Design, 132 (2017) 479 3. B. Yuksel, T. O. Ozkan, Mater. Sci. – Poland, 33 (2015) 220", publisher = "University of Belgrade, Institute for Multidisciplinary Research", journal = "5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia", title = "The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics doped with Al3+, B3+, Mg2+", pages = "135-134", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2036" }
Luković Golić, D., Vukašinović, J., Ribić, V., Kocen, M., Podlogar, M., Dapčević, A., Branković, G.,& Branković, Z.. (2019). The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics doped with Al3+, B3+, Mg2+. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia University of Belgrade, Institute for Multidisciplinary Research., 134-135. https://hdl.handle.net/21.15107/rcub_rimsi_2036
Luković Golić D, Vukašinović J, Ribić V, Kocen M, Podlogar M, Dapčević A, Branković G, Branković Z. The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics doped with Al3+, B3+, Mg2+. in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:134-135. https://hdl.handle.net/21.15107/rcub_rimsi_2036 .
Luković Golić, Danijela, Vukašinović, Jelena, Ribić, Vesna, Kocen, Matej, Podlogar, Matejka, Dapčević, Aleksandra, Branković, Goran, Branković, Zorica, "The influence of sintering processing on microstructural, optical and electrical properties of zinc oxide ceramics doped with Al3+, B3+, Mg2+" in 5th Conference of the Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):134-135, https://hdl.handle.net/21.15107/rcub_rimsi_2036 .