Structure of the amorphous titania precursor phase of N-doped photocatalysts

Grey, Ian E.; Bordet, Pierre; Wilson, Nick

doi:10.1039/d0ra08886b

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…The few uninterpreted diffraction peaks do not match any titania polymorph, nor could they be related to any other reasonable reaction product, such as those presented in the computational study discussed below, with the obvious substitution of NH 3−n residues with CH 3 (CH 2 ) 5 NH 2−n ones ( n = 0, 1, 2). Additionally, the large incoherent scattering raising the overall background level suggests that noncrystalline components are present (amorphous titania and its congeners [ 34 ], to mention a few).…”

Section: Resultsmentioning

confidence: 99%

Long-Term Stability of TiS2–Alkylamine Hybrid Materials

et al. 2022

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Layered TiS2 intercalated with linear alkylamines has recently attracted significant interest as a model compound for flexible n-type thermoelectric applications, showing remarkably high power factors at room temperature. The thermal and, particularly, environmental stability of such materials is, however, a still an open challenge. In this paper, we show that amine-intercalated TiS2 prepared by a simple mechanochemical process is prone to chemical decomposition through sulfur exsolution, and that the presence of molecular oxygen is likely to mediate the decomposition reaction. Through computational analysis of the possible reaction pathways, we propose that Ti-N adducts are formed as a consequence of amine groups substituting for S vacancies on the internal surfaces of the S-Ti-S layers. These findings provide insights for possible future applications of similar hybrid compounds as devices operating in ambient conditions, and suggest isolating them from atmospheric oxygen.

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Section: Resultsmentioning

confidence: 99%

Long-Term Stability of TiS2–Alkylamine Hybrid Materials

et al. 2022

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“…Harrington et al (2012) have shown how the PDF and Debye methods can be combined to maximise the information on the local structure obtainable from PXRD patterns of highly disordered materials. We have recently applied the combination of PDF and Debye methods to establish a model for the local order in amorphous titania (Grey et al, 2021). It is possible that a high-energy synchrotron X-ray data collection on angastonite, with calculation of the PDF, could provide additional information on its local structure.…”

Section: Status Of Amorphous Mineralsmentioning

confidence: 99%

Redefinition of angastonite, CaMgAl2(PO4)2(OH)4 ⋅ 7H2O, as an amorphous mineral

et al. 2022

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Abstract. A reinvestigation of the type angastonite specimen from the Penrice marble quarry, South Australia, shows that the published powder X-ray diffraction pattern for the mineral corresponds to a mixture of crystalline phases plus an amorphous phase. The published formula for the mineral, CaMgAl2(PO4)2(OH)4⋅7H2O, has been found to correspond to the amorphous phase. A proposal for the redefinition of angastonite as an amorphous phase has been approved by the IMA CNMNC. Amorphous angastonite is isotropic with an index of refraction in the range 1.33 to 1.40 and a measured density of 1.57(2) g cm−3. It is formed from incongruent leaching of minyulite in circulating Mg- and Ca-bearing solutions. The amorphous phase undergoes local recrystallisation to form penriceite and two other new crandallite-derivative layer phases. A cluster model for the local structure in the amorphous mineral is proposed based on crandallite-type segments. A brief review of amorphous minerals is given.

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Diffraction methods in the characterization of new mineral species

Grey

2022

Journal of Solid State Chemistry

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Structure of the amorphous titania precursor phase of N-doped photocatalysts

Abstract: Amorphous titania samples prepared by ammonia solution neutralization of titanyl sulphate have been characterized by chemical and thermal analyses, and with reciprocal-space and real-space fitting of wide-angle synchrotron X-ray scattering data.

Cited by 3 publications

References 49 publications

Long-Term Stability of TiS2–Alkylamine Hybrid Materials

Long-Term Stability of TiS2–Alkylamine Hybrid Materials

Redefinition of angastonite, CaMgAl<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>4</sub> ⋅ 7H<sub>2</sub>O, as an amorphous mineral

Diffraction methods in the characterization of new mineral species

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Structure of the amorphous titania precursor phase of N-doped photocatalysts

Abstract: Amorphous titania samples prepared by ammonia solution neutralization of titanyl sulphate have been characterized by chemical and thermal analyses, and with reciprocal-space and real-space fitting of wide-angle synchrotron X-ray scattering data.

Cited by 3 publications

References 49 publications

Long-Term Stability of TiS2–Alkylamine Hybrid Materials

Long-Term Stability of TiS2–Alkylamine Hybrid Materials

Redefinition of angastonite, CaMgAl&lt;sub&gt;2&lt;/sub&gt;(PO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;(OH)&lt;sub&gt;4&lt;/sub&gt; ⋅ 7H&lt;sub&gt;2&lt;/sub&gt;O, as an amorphous mineral

Diffraction methods in the characterization of new mineral species

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Redefinition of angastonite, CaMgAl<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>4</sub> ⋅ 7H<sub>2</sub>O, as an amorphous mineral