Scavenging effect on ionic conduction behaviour at the grain boundary of MgO partially stabilised zirconia

Abstract

The scavenging effect of magnesium oxide (MgO) addition on electrical property of 9 mol-% MgO partially stabilised zirconia (Mg-PSZ) was investigated in terms of phase transformation and intergranular phase formation. The addition of MgO up to 5 mol-% caused a stabilisation of Mg-PSZ, which led to an increase in the cubic phase and a decrease in the monoclinic and tetragonal phases in Mg-PSZ. The Mg-PSZ with the addition of 5 mol-% of MgO also exhibited the maximum ionic conductivity (0.3915 S cm⁻¹ at 1500°C) and forsterite (Mg₂SiO₄) was observed on the grain boundaries of Mg-PSZ. The intergranular phases, formed by reactions between the silicon in Mg-PSZ and MgO addition, reduced the grain boundary resistance, because the siliceous phase which is a hindrance for oxygen ion conduction was scavenged by the formation of Mg₂SiO₄.

Keywords

Magnesia partially stabilised zirconia (Mg-PSZ)Stabilisation Scavenging effect Grain boundary resistance Intergranular phase

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References

Muccillo

E. N. S.

and Kleitz

M. J.

: ‘Impedance spectroscopy of Mg-partially stabilized zirconia and cubic phase decomposition’, J. Eur. Ceram. Soc., 1996, 16, 453–465. doi: 10.1016/0955-2219(95)00125-5

Kim

, Min

D. J.

, Lee

Y. S.

and Park

J. H.

: ‘Electrochemical method for controlling the interfacial oxygen in molten Fe with ZrO₂ based solid electrolyte’, ISIJ Int., 2009, 49, 1882–1888. doi: 10.2355/isijinternational.49.1882

Aoki

, Chiang

Y. M.

, Kosacki

, Lee

, Tuller

and Liu

: ‘Solute segregation and grain-boundary impedance in high-purity stabilized zirconia’, J. Am. Ceram. Soc., 1996, 79, 1169–1180. doi: 10.1111/j.1151-2916.1996.tb08569.x

Lee

J. H.

, Mori

, Li

J. G.

, Ikegami

, Komatsu

and Haneda

: ‘Improvement of grain-boundary conductivity of 8 mol% yttria-stabilized zirconia by precursor scavenging of siliceous phase’, J. Electrochem. Soc., 2000, 147, 2822–2829. doi: 10.1149/1.1393612

Verkerk

M. J.

, Winnubst

A. J. A.

and Burggraaf

A. J.

: ‘Effect of impurities on sintering and conductivity of yttria-stabilized zirconia’, J. Mater. Sci., 1982, 17, 3113–3122. doi: 10.1007/BF01203473

Baumard

J. F.

and Abelard

: ‘Science and technology of zirconia’, 2nd edn, 438–555; 1984, Columbus, The American Ceramic Society.

Radford

K. C.

and Bratton

R. J.

: ‘Zirconia electrolyte cells’, J. Mater. Sci., 1979, 14, 59–65. doi: 10.1007/BF01028328

Feighery

A. J.

and Irvine

J. T. S.

: ‘Effect of alumina additions upon electrical properties of 8 mol.% yttria-stabilised zirconia’, Solid State Ionics, 1999, 121, 209–216. doi: 10.1016/S0167-2738(99)00015-6

Verkerk

M. J.

, Middelhuis

B. J.

and Burggraaf

A. J.

: ‘Effect of grain boundaries on the conductivity of high-purity ZrO₂-Y₂O₃ ceramics’, Solid State Ionics, 1982, 6, 159–170. doi: 10.1016/0167-2738(82)90083-2

10.

Yoon

, Van Tyne

C. J.

and Lee

: ‘Effect of alumina addition on the microstructure and grain boundary resistance of magnesia partially-stabilized zirconia’, Curr. Appl. Phys., 2014, 14, 922–927. doi: 10.1016/j.cap.2014.04.010

11.

Grain

C. F.

: ‘Phase relations in the ZrO₂-MgO system’, J. Am. Ceram. Soc., 1967, 50, 288–290. doi: 10.1111/j.1151-2916.1967.tb15111.x

12.

Fleckenstein

, Mochales

, Frank

, Kochbeck

, Zehbe

, Fleck

and Mueller

W. D.

: ‘Tetragonal and cubic zirconia multilayered ceramics: investigation of electrical parameters during automated EPD processing’, Adv. Appl. Ceram., 2014, 113, 35–41. doi: 10.1179/1743676113Y.0000000115

13.

Huang

Y. L.

, Lee

Y. C.

, Tsai

D. C.

, Huang

R. H.

and Shieu

F. S.

: ‘Phase stability and microstructure of manganese-doped calcia-stabilized zirconia heat treated in a reducing atmosphere’, Ceram. Int., 2014, 40, 2373–2379. doi: 10.1016/j.ceramint.2013.08.008

14.

Cho

Y. H.

, Cho

P. S.

, Auchterlonie

, Kim

D. K.

and Lee

J. H.

: ‘Enhancement of grain-boundary conduction in gadolinia-doped ceria by the scavenging of highly resistive siliceous phase’, Acta Mater., 2007, 55, 4807–4815. doi: 10.1016/j.actamat.2007.05.001

15.

Muccillo

E. N. S.

and Kleitz

: ‘Ionic conductivity of fully stabilized ZrO₂: MgO and blocking effects’, J. Eur. Ceram. Soc., 1995, 15, 51–55. doi: 10.1016/0955-2219(95)91299-4