The Tetragonal to Monoclinic Transformation in Ceria-Zirconia

Hugo, G. R.; Muddle, Barry C.

doi:10.4028/www.scientific.net/msf.56-58.357

Cited by 25 publications

(33 citation statements)

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“…Among the listed only the relation (1) has been observed experimentally earlier [31,33,[35][36][37][38]. The relation (3) has been suggested by Bailey [31], but no experimental evidence of its existence has been reported.…”

Section: (013) and T(116)mentioning

confidence: 82%

“…The authors of [31,32,34,[36][37][38] used the basecentered tetragonal cell (face-centered if only the Zrsublattice is considered), which is doubled with respect to the conventional cell. In Table 1 the orientation relations are presented for both the cell choices (in bold are shown the relations as they appeared in the original papers; the conversion of indices into the other setting was done by us).…”

Section: Introductionmentioning

confidence: 99%

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HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂

Kasatkin

Girgsdies

Ressler

et al. 2004

Journal of Materials Science

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Section: (013) and T(116)mentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂

Kasatkin

Girgsdies

Ressler

et al. 2004

Journal of Materials Science

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“…l c, which includes three sets of diffraction patterns, namely, M-phase, Tphase and its twin. The orientation relationship between the two phases is indexed as follows: [1 00]tll [1]-0], (00 1)tlI(00 lm), which is quite different from previous studies [2][3][4]. This kind of orientation relationship of stress-induced T ~ M transformation is rather complicated and is determined by many factors such as grain size, temperature and transformation mechanism.…”

mentioning

confidence: 94%

HREM investigation of interface between tetragonal and monoclinic phases in a ZrO2(3mol %Y2O3) ceramic

et al. 1996

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“…This means that monoclinic ZrO 2 comes from a variant structure with point group M 3 . It should be mentioned that the orientation relationships compatible with the M 1,2 -monoclinic variants have also been reported (see for instance [HM90,FBV90,Si97]). …”

Section: An Example: Zirconiamentioning

confidence: 99%

Elastic crystals with a triple point

Truskinovsky¹,

Zanzotto²

2002

Journal of the Mechanics and Physics of Solids

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The peculiar behavior of active crystals is due to the presence of evolving phase mixtures the variety of which depends on the number of coexisting phases and the multiplicity of symmetryrelated variants. According to Gibbs' phase rule, the number of phases in a single-component crystal is maximal at a triple point in the p-T phase diagram. In the vicinity of this special point the number of metastable twinned microstructures will also be the highest -a desired effect for improving performance of smart materials. To illustrate the complexity of the energy landscape in the neighborhood of a triple point, and to produce a workable example for numerical simulations, in this paper we construct a generic Landau strain-energy function for a crystal with the coexisting tetragonal (t), orthorhombic (o), and monoclinic (m) phases. As a guideline, we utilize the experimental observations and crystallographic data on the t-o-m transformations of zirconia (ZrO 2 ), a major toughening agent for ceramics. After studying the kinematics of the t-o-m phase transformations, we re-evaluate the available experimental data on zirconia polymorphs, and propose a new mechanism for the technologically important t-m transition. In particular, our proposal entails the softening of a different tetragonal modulus from the one previously considered in the literature. We derive the simplest expression for the energy function for a t-o-m crystal with a triple point as the lowest-order polynomial in the relevant strain components, exhibiting the complete set of wells associated with the t-o-m phases and their symmetry-related variants. By adding the potential of a hydrostatic loading, we study the p-T phase diagram and the energy landscape of our crystal in the vicinity of the t-o-m triple point. We show that the simplest assumptions concerning the order-parameter coupling and the temperature dependence of the Landau coefficients produce a phase diagram that is in good qualitative agreement with the experimental diagram of ZrO 2 .

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The Tetragonal to Monoclinic Transformation in Ceria-Zirconia

Cited by 25 publications

References 0 publications

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂

HREM investigation of interface between tetragonal and monoclinic phases in a ZrO2(3mol %Y2O3) ceramic

Elastic crystals with a triple point

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The Tetragonal to Monoclinic Transformation in Ceria-Zirconia

Cited by 25 publications

References 0 publications

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO2

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO2

HREM investigation of interface between tetragonal and monoclinic phases in a ZrO2(3mol %Y2O3) ceramic

Elastic crystals with a triple point

Contact Info

Product

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HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂

HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO₂