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Influence of mechanical activation on synthesis and properties of the MgO-TiO2 system

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2007
221.pdf (6.087Mb)
Authors
Petrović, Vera
Maričić, Aleksa
Labus, Nebojša
Ristić, Momčilo M.
Contributors
Ristić, Momčilo M.
Article (Published version)
Metadata
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Abstract
Materials applied in electronics such as multilayer capacitors are an important field of ceramic materials. Magnesium titanate based dielectric materials are used for producing type-I capacitors. A common way of obtaining this material is a solid-state reaction during reaction sintering. The process of sintering can be enhanced if mechanical activation precedes. In this work starting powders of magnesium carbonate (MgCO3) and titanium dioxide (TiO2) with a rutile crystal modification were weighed to attain a 1:1 molar MgCO3:TiO2 ratio. Mechanical activation of the starting mixture was performed by high energy ball milling using ZrO balls and vessels with a ball to powder mass ratio of 40:1. The observed grinding times were 15, 30, 60 and 120 minutes. Powder characterization was conducted using X ray powder diffraction, DTA analysis up to 1000 o C and particle morphology changes were observed with Scanning Electron Microscopy. Isothermal sintering of compacted powders was conducted at 1...100ºC during 30, 60 and 180 minutes. For specimens synthesized in such a manner, microwave dielectric properties were measured, quality factor Q, specific electrical resistivity (ρ) and the dielectric constant (Єr). In this work we explain the influence of mechanical activation on the MgCO3-TiO2 system leading to titanate formation during sintering, as well as induced changes in microwave dielectric properties.

Keywords:
sintering / MgO / TiO2 / dielectric constant / quality factor / specific electrical resistivity
Source:
Science of Sintering, 2007, 31, 1, 59-65
Publisher:
  • Belgrade : International Institute for the Science of Sintering

DOI: 10.2298/SOS0701059P

ISSN: 1820-7413 (Online); 0350-820X

WoS: 000247123000008

Scopus: 2-s2.0-70849104590
[ Google Scholar ]
3
3
Handle
https://hdl.handle.net/21.15107/rcub_dais_224
URI
https://dais.sanu.ac.rs/123456789/224
Collections
  • ИТН САНУ - Општа колекција / ITS SASA - General collection
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - JOUR
AU  - Petrović, Vera
AU  - Maričić, Aleksa
AU  - Labus, Nebojša
AU  - Ristić, Momčilo M.
PY  - 2007
UR  - https://dais.sanu.ac.rs/123456789/224
AB  - Materials applied in electronics such as multilayer capacitors are an important field of ceramic materials. Magnesium titanate based dielectric materials are used for producing type-I capacitors. A common way of obtaining this material is a solid-state reaction during reaction sintering. The process of sintering can be enhanced if mechanical activation precedes. In this work starting powders of magnesium carbonate (MgCO3) and titanium dioxide (TiO2) with a rutile crystal modification were weighed to attain a 1:1 molar MgCO3:TiO2 ratio. Mechanical activation of the starting mixture was performed by high energy ball milling using ZrO balls and vessels with a ball to powder mass ratio of 40:1. The observed grinding times were 15, 30, 60 and 120 minutes. Powder characterization was conducted using X ray powder diffraction, DTA analysis up to 1000 o C and particle morphology changes were observed with Scanning Electron Microscopy. Isothermal sintering of compacted powders was conducted at 1100ºC during 30, 60 and 180 minutes. For specimens synthesized in such a manner, microwave dielectric properties were measured, quality factor Q, specific electrical resistivity (ρ) and the dielectric constant (Єr). In this work we explain the influence of mechanical activation on the MgCO3-TiO2 system leading to titanate formation during sintering, as well as induced changes in microwave dielectric properties.
PB  - Belgrade : International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Influence of mechanical activation on synthesis and properties of the MgO-TiO2 system
SP  - 59
EP  - 65
VL  - 31
IS  - 1
DO  - 10.2298/SOS0701059P
UR  - https://hdl.handle.net/21.15107/rcub_dais_224
ER  - 
@article{
author = "Petrović, Vera and Maričić, Aleksa and Labus, Nebojša and Ristić, Momčilo M.",
year = "2007",
abstract = "Materials applied in electronics such as multilayer capacitors are an important field of ceramic materials. Magnesium titanate based dielectric materials are used for producing type-I capacitors. A common way of obtaining this material is a solid-state reaction during reaction sintering. The process of sintering can be enhanced if mechanical activation precedes. In this work starting powders of magnesium carbonate (MgCO3) and titanium dioxide (TiO2) with a rutile crystal modification were weighed to attain a 1:1 molar MgCO3:TiO2 ratio. Mechanical activation of the starting mixture was performed by high energy ball milling using ZrO balls and vessels with a ball to powder mass ratio of 40:1. The observed grinding times were 15, 30, 60 and 120 minutes. Powder characterization was conducted using X ray powder diffraction, DTA analysis up to 1000 o C and particle morphology changes were observed with Scanning Electron Microscopy. Isothermal sintering of compacted powders was conducted at 1100ºC during 30, 60 and 180 minutes. For specimens synthesized in such a manner, microwave dielectric properties were measured, quality factor Q, specific electrical resistivity (ρ) and the dielectric constant (Єr). In this work we explain the influence of mechanical activation on the MgCO3-TiO2 system leading to titanate formation during sintering, as well as induced changes in microwave dielectric properties.",
publisher = "Belgrade : International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Influence of mechanical activation on synthesis and properties of the MgO-TiO2 system",
pages = "59-65",
volume = "31",
number = "1",
doi = "10.2298/SOS0701059P",
url = "https://hdl.handle.net/21.15107/rcub_dais_224"
}
Petrović, V., Maričić, A., Labus, N.,& Ristić, M. M.. (2007). Influence of mechanical activation on synthesis and properties of the MgO-TiO2 system. in Science of Sintering
Belgrade : International Institute for the Science of Sintering., 31(1), 59-65.
https://doi.org/10.2298/SOS0701059P
https://hdl.handle.net/21.15107/rcub_dais_224
Petrović V, Maričić A, Labus N, Ristić MM. Influence of mechanical activation on synthesis and properties of the MgO-TiO2 system. in Science of Sintering. 2007;31(1):59-65.
doi:10.2298/SOS0701059P
https://hdl.handle.net/21.15107/rcub_dais_224 .
Petrović, Vera, Maričić, Aleksa, Labus, Nebojša, Ristić, Momčilo M., "Influence of mechanical activation on synthesis and properties of the MgO-TiO2 system" in Science of Sintering, 31, no. 1 (2007):59-65,
https://doi.org/10.2298/SOS0701059P .,
https://hdl.handle.net/21.15107/rcub_dais_224 .

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