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On the role of oxygen vacancies and lattice strain in the tetragonal to monoclinic transformation in alumina/zirconia composites and improved environmental stability ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
8333 587 2010 8 PDF Available
Title
On the role of oxygen vacancies and lattice strain in the tetragonal to monoclinic transformation in alumina/zirconia composites and improved environmental stability ☆
Abstract

The aim of this paper is to clarify at the nanometer scale the relevant factors influencing the hydrothermal resistance to polymorphic transformation of alumina/zirconia composites, primary candidates for artificial joint applications. The topographic distribution of oxygen vacancies and lattice strain on the composite surface were visualized by means of cathodoluminescence spectroscopy and mapped as a function of exposure time in a thermally activated water vapor environment (i.e., simulating the exposure in human body). Systematically monitoring the optical activity of oxygen vacancies in both alumina and zirconia phases also revealed the effect of surface lattice strain accumulation on the kinetics of polymorphic transformation. From the presented data, an explicit role is evinced for surface oxygen vacancy formation in the alumina matrix, an important step in the complex cascade of mechanochemical events determining the superior environmental resistance of the composite.

Keywords
Alumina; Zirconia; Stress analysis; Microstructure
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On the role of oxygen vacancies and lattice strain in the tetragonal to monoclinic transformation in alumina/zirconia composites and improved environmental stability ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 31, Issue 27, September 2010, Pages 6901–6908
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us