2016
DOI: 10.1016/j.jallcom.2015.09.220
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Crystalline to amorphous phase transformation of Ta 2 O 5 quantum dots driven by residual stress

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Cited by 5 publications
(3 citation statements)
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“…79-1375). 70 The diffuse reectance and the corresponding Kubelka-Munk plots revealed a shallow spectrum for the 450 C calcined sample, conrming the amorphous nature of the Ta 2 O 5 . The thin lm calcined at 700 C was found to exhibit a band gap of 4.26 eV, which is similar to that reported in the literature.…”
Section: Resultsmentioning
confidence: 94%
“…79-1375). 70 The diffuse reectance and the corresponding Kubelka-Munk plots revealed a shallow spectrum for the 450 C calcined sample, conrming the amorphous nature of the Ta 2 O 5 . The thin lm calcined at 700 C was found to exhibit a band gap of 4.26 eV, which is similar to that reported in the literature.…”
Section: Resultsmentioning
confidence: 94%
“…In addition, as Cr 3+ is oxidized, some of the strong ligand field stabilization for the octahedral site is removed, creating a large driving force for a collapse of the structure. In addition, the large size difference of Cr 6+ and Cr 3+ in the Cr layers can lead to mechanical stress, resulting in a crystalline-to-amorphous transition when the stress is accumulated, as often observed in metal oxides and silicon. …”
Section: Discussionmentioning
confidence: 99%
“…peaks after the 'transition' and the broadening visible in other peaks, we consider it more likely that the merging is due to P-induced broadening of adjacent peaks. This phenomenon has been previously attributed to local disorder among competing Ta coordination polyhedra [18,57] and may be the source of the residual stress buildup interpreted to lead to the amorphous transition [17,58]. We tried fitting a δ phase EoS to only those patterns at P above the peak merger, but the results did not differ from the δ EoS parameters fit over the full range of patterns.…”
Section: Discussionmentioning
confidence: 99%