Characterization of nanocrystalline anatase titania: an in situ HTXRD study

Jagtap, Neelam; Bhagwat, Mahesh; Awati, Preeti; Ramaswamy, V.

doi:10.1016/j.tca.2004.08.011

Cited by 51 publications

(20 citation statements)

References 20 publications

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“…species were on the surface, but no O t to react with them, so the phase transformation was retarded. This phenomenon is in agreement with HTXRD results in vacuum reported by Jagtap et al [23].…”

Section: Resultssupporting

confidence: 93%

Effect of oxygen and WO3 additive on anatase-to-rutile phase transformation in TiO2 nanoparticles

Wang

Wen

Sawada

et al. 2014

J Therm Anal Calorim

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Phase transformation of TiO 2 powder (P25) and pure anatase (PA) was investigated under pure oxygen as well as vacuum from 500 to 1,000°C. The rutile percentage calculated based on the XRD data was used to estimate the phase transformation process. It was found that the vacuum suppressed the phase transformation of P25 relative to pure oxygen atmosphere. A model was proposed to explain the effect of oxygen on the phase transformation of TiO 2 . Furthermore, P25 samples showed lower phase transformation temperature (between 600 and 800°C) compared with PA (over 1,000°C). The existed rutile phase in P25 was regarded as a transformation inducer due to an interface between anatase and rutile phases since the nucleation activation energy on the interface is lower than that on the surface. And this interface effect is also adopted to explain the role of additive WO 3 , which retarded the phase transformation of P25 but promoted the phase transformation of PA.

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Section: Resultssupporting

confidence: 93%

Effect of oxygen and WO3 additive on anatase-to-rutile phase transformation in TiO2 nanoparticles

Wang

Wen

Sawada

et al. 2014

J Therm Anal Calorim

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“…This is in accordance with the expectations as that the lattice expansion should occur with the increase in temperature [31]. The thermal expansion coefficient α(T) is determined from the temperature dependence of the lattice parameter a(T), using the following relation [32]:…”

Section: Resultssupporting

confidence: 84%

Relaxation studies of bulk samarium doped ceria electrolyte

Bhosale

Joshi

Pawar

et al. 2010

Ionics

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The nanocrystalline samarium doped ceria powder of phase Ce 0.8 Sm 0.2 O 1.9 was pelletized and sintered at about 1,623 K for the study of relaxation process. The impedance measurements were done within the frequencies from 1 Hz to 1 MHz for wide temperature range of 529-673 K. The temperature-dependent relaxation frequency found to be shifted towards higher frequency region from 17.26 to 707.96 KHz and the corresponding relaxation time for oxygen ions transport was varied from 9.22 to 0.22 μS. The temperature dependent conductivity and relaxation frequency revealed Arrhenius nature, showing activation energies 1.18 and 1.01 eV, respectively. This difference was attributed to pronounced interference due to the grain boundaries. The effect of sintering on microstructure of the sample was studied by using SEM and X-ray diffractometer (XRD). The structural and phase stability study was done by hightemperature (HT)-XRD. The thermal expansion coefficient of the samarium doped ceria powder determined from HT-XRD was found to be 13.9×10 −6 K −1 .

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“…This confirms that prepared titania based samples have anatase crystallinity which is suitable for good photocatalytic performance. [15] For the silica based system one broad peak was observed that indicates the well-known amorphous nature of silica materials.…”

Section: Structure Of Chromium Loaded Photocatalytic Systemsmentioning

confidence: 99%