A Thermodynamic Study of Tin Oxides by Coulometric Titration

Yang, Lizi; Zhitong, Sui; Chan-Zheng, Wang

doi:10.1006/jssc.1994.1363

Cited by 17 publications

(4 citation statements)

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“…Due to lability and accessibility for ambient molecules adsorption, surface vacancies are hardly detectable experimentally. Quantitatively the oxygen deficiency in metal oxides can be determined by thermodesorption of oxygen, thermal gravimetric analysis, coulometric titration under variable oxygen pressure [173][174][175]. The occurrence of intrinsic oxygen vacancies was inferred from indirect investigations by conduction measurements, optical spectroscopy, photoluminescence and cathodoluminescence [170].…”

Section: Conflicts Of Interestmentioning

confidence: 99%

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

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Section: Conflicts Of Interestmentioning

confidence: 99%

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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“…Conventional approaches of structure determination seem to fail. Different stoichiometries n : m have been reported in literature, in particular, Sn 2 O 3 [7][8][9][10][11][12][13][14][15] and Sn 3 O 4 [16][17][18][19][20][21][22][23][24], both with almost the same occurrences in scientific publications. Despite its still uncertain stoichiometry, the intermediate phase is already applied to photocatalysis and shows great technological potential [25,26].…”

Section: Introductionmentioning

confidence: 99%

Raman studies of the intermediate tin-oxide phase

Eifert

Becker

Reindl

et al. 2017

Phys. Rev. Materials

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The existence of an intermediate phase of tin oxide was first reported in 1882. However, its stoichiometry and its crystal structure have been dubious and heavily debated ever since, despite a multitude of structural investigations. We show that Raman spectroscopy combined with ab initio theory offers a viable alternative for structure determination in cases where diffraction studies are inconclusive. We unambiguously identify the intermediate phase as Sn 3 O 4 and rule out the other likely candidate, Sn 2 O 3. We assign the one-phonon Raman signals of Sn 3 O 4 to the mode symmetries of the corresponding point group C 2h and confirm that P 2 1 /c with 14 atoms per unit cell is the space group of Sn 3 O 4 .

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“…Also, the heat capacity of the compound SnO was taken from this source. The heat of formation of SnO determined by Li-Zi et al [34] (-285920 J / mol) was used for the optimization combined together with the phase diagram data [32]. The assessed value is -289853 J / mol, the difference to the measured value being about 1.37 %.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic assessment of oxide system In₂O₃-SnO₂-ZnO

et al. 2018

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The In 2 O 3 -SnO 2 -ZnO system is of special interest for applications as transparent conducting oxides and also transparent semiconductors. In the present work, a thermodynamic assessment for this system is discussed using all available experimental data on phase equilibria and thermodynamic properties. All subsystems including elemental combinations were considered in order to generate a self-consistent Gibbs energy dataset for further calculation and prediction of thermodynamic properties of the system. The modified associate species model was used for the description of the liquid phase. Particular attention was given to two significant solid solution phases: Spinel with the formula Zn (2-x) Sn (1-x) In 2x O 4 based on Zn 2 SnO 4 and Bixbyite based on In 2 O 3 and extending strongly toward the SnZnO 3 composition according to the formula In (2-2x) Sn x Zn x O 3 . In addition to the component oxides, nine quasi-binary compounds located in the In 2 O 3 -ZnO binary subsystem have also been included in the database as stoichiometric phases.

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A Thermodynamic Study of Tin Oxides by Coulometric Titration

Cited by 17 publications

References 0 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Raman studies of the intermediate tin-oxide phase

Thermodynamic assessment of oxide system In₂O₃-SnO₂-ZnO

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A Thermodynamic Study of Tin Oxides by Coulometric Titration

Cited by 17 publications

References 0 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Raman studies of the intermediate tin-oxide phase

Thermodynamic assessment of oxide system In2O3-SnO2-ZnO

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Thermodynamic assessment of oxide system In₂O₃-SnO₂-ZnO