Preparation of stoichiometric barium stannate thin films: Hall measurements and gas sensitivities

Ostrick, Bernhard; Fleischer, Maximilian; Lampe, U.; Meixner, H.

doi:10.1016/s0925-4005(97)00141-x

Cited by 67 publications

(37 citation statements)

References 7 publications

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“…Therefore, the assumption that CO oxidation over BaSnO 3 samples may be described by Mars-van Krevelen mechanism is rational. On the other hand, the high temperature of the total CO or H 2 oxidation explains why the gas sensors based on BaSnO 3 work usually at temperatures higher than 600°C [13,14]. Only under such conditions CO or H 2 oxidation occurs with high rates and yields, which leads to the reduction of oxide and the formation of the surface vacancy (V o * ) connected with the change of electric conductivity of BaSnO 3 (reaction 2).…”

Section: Catalytic Activity Of Basno 3 and Pt/basno 3 Catalysts In Oxmentioning

confidence: 99%

“…The electrical properties of barium stannate such as electrical resistance, capacitance or impedance are dependent on temperature, partial oxygen pressure, the nature of the surrounding gases and their concentrations. Hence, in recent years, BaSnO 3 has been considered a very promising gas sensor material for the detection of many different gases like: H 2 or CO [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…The temperature at which sensitivity to CO reaches its maximum is usually higher than 600°C [13,14]. In the case of BaSnO 3 with supported Pt, the sensor operating temperature is markedly lower [15].…”

Section: Introductionmentioning

confidence: 99%

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CO and H2 oxidation over Pt/BaSnO3 catalysts

Kocemba

Długołęcka

Wróbel-Jędrzejewska

et al. 2017

Reac Kinet Mech Cat

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This work reports the results of the studies on oxidation of carbon monoxide and H 2 over Pt supported on barium stannate (BaSnO 3 -perovskite type oxide). The composition and properties of Pt/BaSnO 3 catalysts were characterized by X-ray diffraction (XRD), time-of-flight secondary ion mass spectrometry (TOF-SIMS), H 2 and CO chemisorption, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and tested in the reactions of carbon monoxide and hydrogen oxidation. It was stated that platinum strongly interacts with BaSnO 3 . The catalytic activity and adsorption properties of Pt/BaSnO 3 catalysts are determined by these interactions. The presence of different species (which generally can be labelled as [(Pt)BaSnO 3 ]) resulting from platinum and BaSnO 3 chemical interaction was found by the TOF-SIMS on surface of Pt/BaSnO 3 catalysts. The mechanism of CO and H 2 oxidation over Pt/BaSnO 3 catalysts was discussed in the light of strong interactions between Pt and BaSnO 3 .

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Section: Catalytic Activity Of Basno 3 and Pt/basno 3 Catalysts In Oxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CO and H2 oxidation over Pt/BaSnO3 catalysts

Kocemba

Długołęcka

Wróbel-Jędrzejewska

et al. 2017

Reac Kinet Mech Cat

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“…Its high performance application such as semiconductive sensor material for exhaust gases (isobutane, H 2 , NO, CO and CH 4 ) are one of the main reasons for the demand of BaSnO 3 perovskite stannate [1][2][3]. However this perovskite is also interesting for other applications like, thermally stable capacitor due to the characteristics of its dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation and variable-range-hopping conduction in BaSn1−x Cr x O3 system

Upadhyay¹,

Kumar

2007

J Electroceram

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The possibility of formation of a solid solution in the system BaSn 1−x Cr x O 3 has been explored upto x≤0.20. It has been confirmed that single phase solid solution forms upto x≤0.10. Dielectric and conduction behaviour of single phase samples have been studied in the temperature range 400-610 K and frequency range 10 Hz-2 MHz. Two dielectric relaxation processes in two different frequency ranges have been observed. The temperature dependence of both dc and ac resistivity obey relation ρ=ρ o exp(B/T 1/4 ), indicative of variable range hopping conduction mechanism. The activation energy for dc conduction is higher than that for relaxation time (t) of low frequency dielectric relaxation process. It has been observed that activation energy for dielectric relaxation matches with activation energy for ac conductivity (at 100 kHz) for both the dielectric relaxation processes. Seebeck coefficient 'a' of the samples have been measured in the temperature range 350-650 K. Negative value of 'a' in the entire range of temperature measurement shows that conduction species are negatively charged. On the basis of value of activation energy for dc conduction and sign of Seebeck coefficient, conduction in the low temperature region (below 500 K) is attributed to hopping of weakly bonded electrons among Sn 2+ ⇔ Sn 4+ or Sn 3+ ⇔ Sn 4+ and that in the high temperature region (above 500 K) to hopping of doubly ionized oxygen vacancies V o À Á .

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“…57 Dentre as diversas aplicações para o BaSnO 3 , a aplicação como sensor de gasesé reportado em vários trabalhos. Os resultados obtidos mostraram que o BaSnO 3é um promissor material para detecção de gases da família dos hidrocarbonetos (7,9,26,27). * Processo em que se dá o rompimento das ligações de hidroxilas (OH − ) do composto.…”

Section: Agradecimentosunclassified

Propriedades estruturais, microestruturais e elétricas da cerâmica BaSnO3

Nascimento¹

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The surface properties of ceramic powders play an important role in the production of devices of high quality, high performance and reliability. Many of these properties are related to interactions with the environment. One example, ceramics are used in gas sensor devices. A ceramic material that has been reported as promising gas sensor is perovskite BaSnO 3 (barium stannate). In this work we performed the synthesis of the BaSnO 3 compound by solid state reaction to study its structural properties, microstructure and electrical behavior in function of atmosphere. The samples were characterized by thermogravimetry, differential scanning calorimetry, x-ray diffraction, scanning electron microscopy, dilatometry and impedance spectroscopy. For the production of BaSnO 3 used two methods of synthesis. the first method, called route 1, the preparation was performed directly from the mixing of powder precursors. The second, named as route 2, the precursor powders were subjected to heating separately before mixing. The results obtained using the route 1 showed the presence of secondary phases (SnO 2 and BaCO 3 ) and the formation of liquid phase during sintering of the ceramics. The results obtained with the procedure adopted in the route 2 showed only the presence of the desired (BaSnO 3 ) phase and no liquid phase during sintering. In order to investigate what the effects caused by the water adsorption by perovskite BaSnO 3 , the green-ceramic bodies produced by route 2 were submitted to immersion in water prior to sintering. This procedure did not result in the appearance of secondary phases, but was verified the presence of the liquid phase, and the ceramics showed lower density and larger average grain size. For the electrical characterization we used the following atmospheres: vacuum, air, argon containing 5% hydrogen and argon containing 15% hydrogen. The results showed that the barium stannate shows a significant sensitivity to the conductivity in the studied atmospheres at temperatures above 100 o C.

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Preparation of stoichiometric barium stannate thin films: Hall measurements and gas sensitivities

Cited by 67 publications

References 7 publications

CO and H2 oxidation over Pt/BaSnO3 catalysts

CO and H2 oxidation over Pt/BaSnO3 catalysts

Dielectric relaxation and variable-range-hopping conduction in BaSn1−x Cr x O3 system

Propriedades estruturais, microestruturais e elétricas da cerâmica BaSnO3

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