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Sharma, Saurabh Kumar
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article
Response of nonstoichiometric pyrochlore composition Nd1.8Zr2.2O7.1 to electronic excitations
Abstract
<jats:title>Abstract</jats:title><jats:p>In response of swift heavy ion (100 MeV I<jats:sup>9+</jats:sup>) irradiation, the irradiation‐induced disordering in nonstoichiometric pyrochlore composition (Nd<jats:sub>1.8</jats:sub>Zr<jats:sub>2.2</jats:sub>O<jats:sub>7.1</jats:sub>) was compared to that of stoichiometric composition Nd<jats:sub>2</jats:sub>Zr<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub>. Both compositions were prepared through auto gel‐combustion followed by sintering under the identical conditions. Systematic analysis of the compositions before and after irradiation was performed with X‐ray diffraction (XRD), Raman spectroscopy, and plane‐view high‐resolution transmission electron microscopy (HRTEM) techniques. Irradiation caused pyrochlore to amorphous phase transformation was observed in both compositions except the slower rate of amorphization in Nd<jats:sub>1.8</jats:sub>Zr<jats:sub>2.2</jats:sub>O<jats:sub>7.1</jats:sub>. The amorphization was achieved as a consequence of isolated disordered track overlapping at higher ion fluence with the estimated track diameter 2.73 ± 0.05 and 3.46 ± 0.30 nm for Nd<jats:sub>1.8</jats:sub>Zr<jats:sub>2.2</jats:sub>O<jats:sub>7.1</jats:sub> and Nd<jats:sub>2</jats:sub>Zr<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub>, respectively, employing the framework of single‐ion impact model to XRD results. HRTEM micrographs also revealed the less prevalence of irradiation‐induced amorphization in Nd<jats:sub>1.8</jats:sub>Zr<jats:sub>2.2</jats:sub>O<jats:sub>7.1</jats:sub> with the observed irradiation‐induced modified track region composed of defect‐rich pyrochlore structure, anion‐deficient fluorite structure, and amorphous domains; with the diameter of 3.0 ± 1.0 nm and 5.0 ± 1.0 nm in Nd<jats:sub>1.8</jats:sub>Zr<jats:sub>2.2</jats:sub>O<jats:sub>7.1</jats:sub> and Nd<jats:sub>2</jats:sub>Zr<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub>, respectively. The preexisting anion‐deficient fluorite structure in Nd<jats:sub>1.8</jats:sub>Zr<jats:sub>2.2</jats:sub>O<jats:sub>7.1</jats:sub> helps in its epitaxial growth as recovered structure from melted ion track during irradiation‐induced rapid cooling.</jats:p>