Phase stability of the two isomorphs monoclinic zirconia and hafnia under MeV ion irradiation

Benyagoub, A.

doi:10.1016/j.actamat.2012.06.030

Cited by 14 publications

(6 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The damage mechanism leading to the atomic movements in the track region however is still not clear. To alienate one mechanism over the other, Benyagoub 12 – 14 studied SHI induced structural phase transformation in ZrO 2 and HfO 2 , which have similar physical and chemical properties but have important differences like specific gravity and transition temperature from one phase to the other.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Anatase and Rutile Phases of TiO2 to ion irradiation: Examination of the applicability of Coulomb Explosion and Thermal Spike Models

Rath

Dash

Benyagoub

et al. 2018

Sci Rep

Self Cite

View full text Add to dashboard Cite

Sensitivity of the anatase and rutile phases of titanium dioxide to Swift Heavy Ion (SHI) irradiation was experimentally probed and compared with the predictions of the Coulomb explosion, analytical and inelastic thermal spike models of ion-matter interaction. Conforming to the predictions of all these models, our study indicated higher sensitivity of anatase to these ions than the rutile phase. A detailed examination however revealed that Coulomb explosion model cannot explain either the nature of variation of the interaction cross section of SHI with the energy deposited by these ions, Se to the target electrons, or the relative values of the threshold electronic energy loss, Seth of anatase and rutile. The analytical thermal spike (a-TS) model, using the available physicochemical data for this oxide, predicted that tracks cannot form either in anatase or in rutile by 297 MeV and 511 MeV Ni ions, while inelastic thermal spike (i-TS) model predicted formation of ion tracks by 297 MeV Ni ions and their absence with 511 MeV Ni ions in both anatase and rutile. Our observation agreed with the predictions of i-TS model albeit with a difference in the radius of the tracks. In addition, we observed halo of defect ridden crystalline region of much larger radius around the ion track. Interestingly, the radius of the halo scales with the velocity of the ions, which is opposite to the conventionally observed velocity effect.

show abstract

Section: Introductionmentioning

confidence: 99%

Sensitivity of Anatase and Rutile Phases of TiO2 to ion irradiation: Examination of the applicability of Coulomb Explosion and Thermal Spike Models

Rath

Dash

Benyagoub

et al. 2018

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Under normal conditions of temperature and pressure, both oxides are in the monoclinic phase because the zirconium and hafnium cations have the same valence configuration with very similar ionic radii (0.78 Å for Zr +4 and 0.76 Å for Hf +4 ). Since the crystallographic structures of the monoclinic phase of zirconium and hafnium are very close, many of the XRD peaks arise at nearly the same angles (Benyagoub, 2012). The transition temperature from the tetragonal to the monoclinic phase is higher in the case of HfO 2 ($ 1700 C) than for ZrO 2 ($ 1200 C).…”

Section: Xanes Datamentioning

confidence: 98%

Characteristics and local structure of hafnia-silicate-zirconate ceramic nanomixtures

Pop

Rada

et al. 2020

J Synchrotron Radiat

View full text Add to dashboard Cite

Zirconate systems having the composition 3HfO2·15SiO2·xY2O3·(82 − x)ZrO2, where x = 2, 7 and 12 mol% Y2O3, were synthesized by a sol-gel method. The analysis of X-ray diffraction data showed the presence of the t-ZrO2, m-ZrO2, m-HfO2, Y2SiO5 and Y2Si2O7 crystalline phases in a ceramic nanomixture. Spectroscopic data show that the increase of the Y2O3 content of samples determines the increase of the t-ZrO2, m-HfO2 and silicate crystalline phases. Gap energy values decrease almost linearly with increasing Y2O3 content of samples. A detailed study of XANES data does not show a significant difference with increasing Y2O3 content of the samples suggesting an appreciable stability of the hafnium ions +4 oxidation state and their microvicinity. EXAFS results show that the local structure around the Hf cation is similar to that from the monoclinic crystalline HfO2 where the Hf–O coordination number tends to 7. The bond lengths of Hf–O shells show small deviations from ∼2.12 Å and the Hf–metal paths become more structured by increasing the Y2O3 content of the samples.

show abstract

“…Irradiation-induced phase transformations in m-ZrO2 have been extensively reported. A monoclinic-to-tetragonal transformation under ion irradiation has been described by some authors [21][22][23][24], while others claim that the transformation is monoclinic-to-cubic [25][26][27][28],…”

Section: Phase Transformations and Stabilisation Mechanisms Under Irradiationmentioning

confidence: 99%

In-situ TEM study of irradiation-induced damage mechanisms in monoclinic-ZrO2

Liu

Mir

et al. 2020

Acta Materialia

View full text Add to dashboard Cite

We have investigated the microstructural and crystallographic evolution of nanocrystalline zirconia under heavy ion irradiation using in-situ transmission electron microscopy (TEM) and have studied the atomic configurations of defect clusters using aberration-corrected scanning transmission electron microscopy (STEM). Under heavy ion irradiation the monoclinic-ZrO2 is observed to transform into cubic phase, stabilised by the strain induced by irradiationinduced defect clusters. We suggest that the monoclinic-to-cubic transformation is martensitic in nature with an orientation relationship identified to be (100)m∥(100)c and [001]m∥[001]c. By increasing the damage dose, both the formation of voids and irradiationinduced grain growth were observed. A model for the formation of voids is proposed, taking defect interactions into consideration. The study has also demonstrated that high resolution orientation mapping by transmission Kikuchi diffraction (TKD) combined with in-situ irradiation in a TEM is a powerful method to probe the mechanisms controlling irradiationinduced processes, including grain boundary migration, phase transformations and texture evolution.

show abstract

Phase stability of the two isomorphs monoclinic zirconia and hafnia under MeV ion irradiation

Cited by 14 publications

References 37 publications

Sensitivity of Anatase and Rutile Phases of TiO2 to ion irradiation: Examination of the applicability of Coulomb Explosion and Thermal Spike Models

Sensitivity of Anatase and Rutile Phases of TiO2 to ion irradiation: Examination of the applicability of Coulomb Explosion and Thermal Spike Models

Characteristics and local structure of hafnia-silicate-zirconate ceramic nanomixtures

In-situ TEM study of irradiation-induced damage mechanisms in monoclinic-ZrO2

Contact Info

Product

Resources

About