Epitaxial Electrodeposition of Ag(Ag3O4)2NO3 onto Highly Oriented Conducting Metal Oxides in the Pb-Tl-O System


The conducting oxy salt Ag(Ag3O4)2NO3 has been electrodeposited onto highly oriented conducting oxides of Tl203 and Pb0Tl(,Oc. T12O3 was grown in a [100] texture while the mixed oxide PbaTlbOc was grown with two different thickness-dependent textures of [110] and [210]. The orientation of the Ag(Ag3O4)2NO3crystals with respect to the substrate surface was determined by X-ray diffraction. The face-centered-cubic Ag(Ag3O4)2NO3 crystals deposited on body-centered-cubic T1203 and face-centered-cubic Pb„Tl6Oc followed the orientation of these prelayers. However, Ag(Ag3O4)2NO3 electrodeposited onto polycrystalline 430 stainless steel had a nearly random orientation. The lattice mismatch is 6.6% between T12O3 and Ag(Ag3O4)2N03, and it is 7.8% between Ag(Ag3O4)2N03 and the doubled unit cell edge length of PbaTlbOc. It was also found that PbaTl(,Oc undergoes a transition from a body-centered-cubic to a face-centered-cubic Bravais lattice at a lead content (determined on a metals-only basis) of greater than 40 atom %.

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Chemistry of Materials