Epitaxial 8YSZ/Y2 Zr2 O7 multilayers: a conductivity and strain study

Physical Chemistry Chemical Physics : PCCP
Elisa GilardiJoachim Maier

Abstract

Thin films of Y2Zr2O7 were grown via pulsed laser deposition (PLD) on substrates of MgO(110), Al2O3(0001) and Al2O3(11[combining macron]02). Electrical properties were investigated via electrical impedance spectroscopy. Unexpectedly, the ionic conductivity is not affected by the microstructure; only minor differences in conductivities and activation energies were measured between epitaxial thin films (on MgO) and textured thin films (on Al2O3, both orientations). This indicates the grain boundaries of such a material to only marginally block the oxygen vacancy transport. Starting from these results, epitaxial multilayers of Y2Zr2O7 and 8 mol% yttria-stabilized zirconia with same overall thickness (between 60 and 70 nm) and different number of interfaces (from 1 up to 9) have been deposited on MgO(110) and the role of the residual compressive strain on the electrical properties has been investigated by means of XRD analysis and impedance spectroscopy. The results, showing no effect of the strain field on the ionic conductivity, indicate the negligible effect of the compressive strain on the ionic transport properties of the material.

References

Oct 13, 2010·Physical Chemistry Chemical Physics : PCCP·Nicole SchichtelJürgen Janek
May 14, 2011·Physical Chemistry Chemical Physics : PCCP·Marcus C GöbelJoachim Maier
Dec 13, 2012·Physical Chemistry Chemical Physics : PCCP·Bin LiJie Lian
May 17, 2013·Physical Review Letters·J HinterbergR A De Souza
Nov 17, 2010·Science and Technology of Advanced Materials·Emiliana FabbriEnrico Traversa
Jul 26, 2017·ACS Applied Materials & Interfaces·Elisa GilardiJoachim Maier

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