Synthesis and ion-irradiation tolerance of the Dy2TiO5 polymorphs

Aughterson, Robert D.; Zaluzec, Nestor J.; Lumpkin, Gregory R.

doi:10.1016/j.actamat.2020.116518

Cited by 10 publications

(2 citation statements)

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“…For the titanates, solid solutions exist for rare earths from terbium to lutetium with all being described as pyrochlore-type structure, Fd-3 m symmetry [22]. However, in further studies, several RE 2 TiO 5 (RE = Dy, Ho, Er, and Yb) compounds have been described as longrange defect fluorite with nano-domains of pyrochlore-type structure [10,[23][24][25]. There are complete solid solutions for most rare earth zirconates and hafnates [7] with multiphase, 2 or more crystal structure types, regions mainly occurring for the larger rare earths; La 2 ZrO 5 (pyrochlore plus cubic phases), La 2 HfO 5 (pyrochlore plus hexagonal phases), Pr 2 HfO 5 (pyrochlore plus fluorite phases), and Nd 2 HfO 5 (pyrochlore plus fluorite phases).…”

Section: Introductionmentioning

confidence: 99%

“…For the rare earth titanate compounds of RE 2 TiO 5 stoichiometry, a variety of structures and chemistries exist. A range of applications for these compounds have been studied including burnable poisons [9,10], containment matrices for immobilisation of high-level nuclear waste [11][12][13][14][15][16], lithium ion and sodium ion batteries [17], and electronic and ionic conductivity [18][19][20]. Application-based studies on RE 2 ZrO 5 and RE 2 SnO 5 compositions are almost nonexistent although there has been some interest in the zirconates for nuclear-based use, e.g.…”

Section: Introductionmentioning

confidence: 99%

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The ion irradiation tolerance of the fluorite RE2MO5 (RE = Sm, and Yb, M = Ti, Zr, and Sn) system

Aughterson

Newman²,

Ionescu

et al. 2021

J Aust Ceram Soc

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In the search for novel ceramics for use within nuclear fuel-related applications and nuclear waste-form matrices, a major focus has been on the development of radiation-tolerant materials. Of particular interest in this field have been numerous compounds with either pyrochlore or the related fluorite-type structures. In this study, we look to expand the family of compounds with defect fluorite-type structure. We have fabricated three new compounds; Yb 2 Sn 1.125 O 5.25 , Yb 2 Sn 1.25 O 5.5 , and Yb 2 Sn 1.375 O 5.75 . The compound Yb 2 Sn 1.125 O 5.25 was determined, via x-ray diffraction, to have the long-range defect fluorite structure, Fm-3 m symmetry, with cell parameter a = 5.17233(1). Further to this, Sm 2 ZrO 5 and Yb 2 TiO 5 compounds were also fabricated and crystal structures characterised. The use of transmission electron microscopy has revealed a much more complex crystal structure than that of the relatively high symmetry fluorite, with the presence of structural modulations being detected. The ion-irradiation response of these compounds was tested via bulk specimen irradiation using 15-MeV gold ions with grazing incidence x-ray diffraction characterisation. The results show that both Sm 2 ZrO 5 and Yb 2 Sn 1.25 O 5.5 are highly tolerant to ion-irradiation exposure whilst Yb 2 TiO 5 is susceptible to amorphisation.

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