The physicochemical properties of the bismuth iron molybdate system*1

NOTERMANN, T

doi:10.1016/0021-9517(75)90333-4

Cited by 46 publications

(3 citation statements)

References 5 publications

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“…To reduce the problem of contact resistance between a metal wire and a semiconductor with a 2.7 eV band gap, a high bias of 100 V was applied across the outer gold leads. Because the gold wires used are extremely thin, the electric field at their surface can be very high (10 5 −10 6 V/m), leading to tunnel breakdown of the contact resistance or electrolytic breakdown under humid conditions.…”

Section: Methodsmentioning

confidence: 99%

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Isosteric Heat of Adsorption of Water Vapor on Bismuth Iron Molybdate Measured by the Method of Constant Surface Conductance

Sears

2001

Langmuir

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The sensitivity of the four-probe electrical conductance of compressed Bi3FeO4(MoO4)2 powder to humid air was measured under isothermal conditions from 24 to 60 °C at 4 deg intervals. The data were analyzed as the logarithm of the conductance change due to humid air vs the logarithm of the humidity. This was done under quasistatic conditions, so that in the oven chamber the adsorbed surface water was always in equilibrium with the vapor in the air. From this, a series of isoconductance curves were calculated at a number of distinct values. Plotted as the logarithm of the absolute humidity vs 1000 K/T these curves were good fits to a straight line, and via the Clausius-Clapeyron equation gave the isosteric heats of adsorption. The results showed hydrophobic behavior with latent heats ranging from about 0.2 eV (19 kJ/mol, most likely due to single isolated hydrogen bonds) for a very dry surface up to the bulk-water value of 0.45 eV (44 kJ/mol, due to water molecule clustering) for surfaces exposed to high humidity. Previous analysis has shown that the number of layers of adsorbed water varies from one to four for this material, with a conductance change increase measured over 3-4 orders of magnitude.

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Section: Methodsmentioning

confidence: 99%

“…With a band gap of 2.7 eV the stoichiometric material is highly insulating and the vacancies act as donors, about 0.4 eV below the conduction band edge . In this paper, we will only consider the stoichiometric or well-oxidized state of bismuth iron molybdate.…”

Section: Introductionmentioning

confidence: 99%

Isosteric Heat of Adsorption of Water Vapor on Bismuth Iron Molybdate Measured by the Method of Constant Surface Conductance

Sears

2001

Langmuir

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“…19 The spectra of freshly prepared Fe 2 BiMo 2 O x catalyst (Fig. 1, sample 2) indicate the phase composition: Fe 2 (MoO 4 ) 3 , α-Bi 2 (MoO 4 ) 3 , γ-Bi 2 MoO 6 and the ternary compound Fe 2 Bi 3 Mo 2 O 12 with characteristic imprints d/n = 1.9; 1.88; 1.86 Å, 20 as well as with prints d/n = 2.50; 2.31; 2.17 Å, characteristic of the Fe 2 O 3 •(3-4)MoO 3 phase.…”

Section: Resultsmentioning

confidence: 99%

Quantum-Chemical Modeling of Hydrosilylation Reaction of Triethoxysilane to Divinylbenzene

Mukbaniani¹,

Tatrishvili²,

Pachulia³

et al. 2022

ChChT

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Hydrosilylation of triethoxysilane with the mixture of ortho- and para-divinylbenzene in the presen¬ce of Karstedt’s catalyst has been carried out and the corresponding product triethoxy(vinylphenethyl)silane have been obtained. The structure and composition of the obtained product were proved by means of determining molecular mass, molecular refraction, and 1H and 13C NMR spectra data. It was found that the addition reaction proceeds both in ortho-position as well as in para-position. Hydrosilylation proceeds both Markovnikov and anti-Markovnikov rule. Via quantum-chemical calculations using the non-empirical density functional theory (DFT) method, the possible direction of the reaction has been considered.

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Untersuchung der Fe(III)‐ und Fe(II)‐Phasen in einem Mo‐Multikomponenten‐Katalysator auf SiO₂‐Träger mittels Mößbauer‐ und ESR‐Spektroskopie

Mehner

Ulbricht

Geißler

et al. 1980

Zeitschrift anorg allge chemie

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Frische, formierte, gebrauchte und regenerierte Bi‐, Fe‐, Co‐, Ni‐enthaltende Mo‐Multikomponenten‐Katalysatoren auf SiO2‐Träger wurden mittels Mößbauer‐ und ESR‐Spektroskopie bezüglich der Zusammensetzung der Fe(III)‐ und Fe(II)‐Phasen untersucht. Im Frischkontakt liegen 40% des Gesamteisens als α‐Fe2O3 und 60% als Fe2(MoO4)3 vor, im gebrauchten Kontakt 90% als β‐FeMoO4 und 10% als Fe2O3 in gestörter magnetischer Umgebung bzw. in Form sehr kleiner Teilchen. Die formierten Kontakte entsprechen sehr kurzzeitig gebrauchten Kontakten. Die kurzzeitige Regenerierung führt wieder zu magnetisch geordnetem α‐Fe2O3 und magnetisch nicht geordnetem Fe2(MoO4)3. Eine Regenerierung über längere Zeit ergibt eine Aufspaltung der magnetisch nicht geordneten Fe(III)‐Phase in Fe2(MoO4)3 und sehr fein verteiltes Fe2O3.

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The physicochemical properties of the bismuth iron molybdate system*1

Cited by 46 publications

References 5 publications

Isosteric Heat of Adsorption of Water Vapor on Bismuth Iron Molybdate Measured by the Method of Constant Surface Conductance

Isosteric Heat of Adsorption of Water Vapor on Bismuth Iron Molybdate Measured by the Method of Constant Surface Conductance

Quantum-Chemical Modeling of Hydrosilylation Reaction of Triethoxysilane to Divinylbenzene

Untersuchung der Fe(III)‐ und Fe(II)‐Phasen in einem Mo‐Multikomponenten‐Katalysator auf SiO₂‐Träger mittels Mößbauer‐ und ESR‐Spektroskopie

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The physicochemical properties of the bismuth iron molybdate system*1

Cited by 46 publications

References 5 publications

Isosteric Heat of Adsorption of Water Vapor on Bismuth Iron Molybdate Measured by the Method of Constant Surface Conductance

Isosteric Heat of Adsorption of Water Vapor on Bismuth Iron Molybdate Measured by the Method of Constant Surface Conductance

Quantum-Chemical Modeling of Hydrosilylation Reaction of Triethoxysilane to Divinylbenzene

Untersuchung der Fe(III)‐ und Fe(II)‐Phasen in einem Mo‐Multikomponenten‐Katalysator auf SiO2‐Träger mittels Mößbauer‐ und ESR‐Spektroskopie

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Untersuchung der Fe(III)‐ und Fe(II)‐Phasen in einem Mo‐Multikomponenten‐Katalysator auf SiO₂‐Träger mittels Mößbauer‐ und ESR‐Spektroskopie