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Contemporary Materials II−1 (2011)

Contemporary Materials II−1 (2011) Page 51 of 54

UDK 661.882`022‒14:669.721

INFLUENCE OF SYNTHESIS PARAMETERS ON ELECTRICAL PROPERTIES OF SISTEMS MgO-TiO2

V. V. Petrović1,*, S. Obradović2, A. Žorić3, H. Milošević4

1 Higher School of Electrical Engineering and Computers of Vocational Studies, Belgrade, Vojvode Stepe 283, Serbia
2 Megatrend University, Faculty for Computer Sciences, Belgrade, Bulevar umetnosti 29, Serbia
3 Pristina University, Faculty of Technical Sciences, Kosovska Mitrovica, Kneza Miloša 7, Serbia
4 Pristina University, Faculty of Science and Mathematics, Lole Ribara 29, Serbia

 

Ab­stract

In this pa­per mag­ne­si­um car­bo­na­te (MgCO3) and ti­ta­ni­um-di­o­xi­de (TiO2), crystal­li­ne mo­di­fi­ca­tion ru­ti­le we­re used as star­ting pow­ders.. Pro­cess of sin­te­ring can be en­han­ced if mec­ha­ni­cal ac­ti­va­tion pre­ce­des. Mec­ha­ni­cal ac­ti­va­tion of the star­ting mix­tu­re was per­for­med by high energy ball mil­ling using ZrO balls and ves­sels with ball to pow­der mass ra­tio 40:1. The ob­ser­ved grin­ding ti­mes we­re 15, 30, 60 and 120 mi­nu­tes. The 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 (εr).

Keywords: magnesium carbonate, titanium-dioxide, dielectric properties.

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References

[1] W. We­ri­sing, in: B. C. H. Sre­e­le (Ed.), Elec­tro­nic Ce­ra­mics, El­se­vi­er, Lon­don (1991) 67.
[2] G. Wol­fram, H. E. Go­bel, Exi­sten­ce ran­ge, struc­tu­ral and di­e­lec­tric pro­per­ti­es of Zrx­TiySnzO4 ce­ra­mics (x+y+z=2), Ma­te­ri­als Re­se­arch Bul­le­tin 16 (1981) 1455−1463.
[3] S. Nis­hi­ga­ki, FC Rep. 5 (1987) 413, Trans: FC Ann. Rep. Over­sea Re­a­der, (1988) 32.
[4] W. W. Cho, K. Ka­ki­mo­to, H. Oh­sa­to, Mic­ro­wa­ve di­e­lec­tric pro­per­ti­es and low-tem­pe­ra­tu­re sin­te­ring of MgTiO3-Sr­TiO3 ce­ra­mics with B2O3 or CuO, Ma­te­ri­als Sci­en­ce En­gi­ne­e­ring B, 121 (2005) 48−53.
[5] V. Petrovic, Sin­te­ring ki­ne­tics of MgO-TiO2 system, Sci­en­ce of Sin­te­ring 38 (2006) 287− 292. 
[6] Lj. Karanovic, Pri­me­nje­na kri­sta­lo­gra­fi­ja [Ap­plied Crystal­lo­graphy], Uni­ver­zi­tet u Be­o­gra­du, Be­o­grad, 1996 (in Ser­bian).
[7] N. Stu­bi­car, A. To­nejc, M. Stu­bi­car, Mic­ro­struc­tu­ral evo­lu­tion of so­me MgO-TiO2 and MgO-Al2O3 pow­der mix­tu­res du­ring high-energy ball mil­ling and post-an­ne­a­ling stu­died by X-ray dif­frac­tion, Jo­ur­nal of Al­loys and Com­po­unds, 370 (2004) 296−301.
[8] J. Zhu, E. R. Kip­ko­ech, W. Lu, Ef­fects of LnA­lO3 (Ln=La, Nd, Sm) ad­di­ti­ves on the pro­per­ti­es of Ba4.2Nd9.2Ti18O54 ce­ra­mics, Jo­ur­nal of the Euro­pean Ce­ra­mic So­ci­ety 26 (2006) 2027−2030.
[9] C.-L. Hu­ang, Li­qu­id pha­se sin­te­ring of MgTiO3-Ca­TiO3 mic­ro­wa­ve di­e­lec­tric ce­ra­mics,Ma­­te­­ri­als Che­mi­stry and Physics 78 (2002) 111−115.
[10] L. W. Lei, Z. Y. Fu, J. Y. Zhang, In­flu­en­ce of sin­te­ring tem­pe­ra­tu­re on mic­ro­struc­tu­re and mag­ne­to­tran­sport pro­per­ti­es of La0.8Na0.2MnO3 ce­ra­mics, Ma­te­ri­als Let­ters 60 (2007) 970−973.