Composition and structure of phases formed in the process of hydrated antimony pentoxide thermolysis

Klestchov, Dmitri; Burmistrov, V. A.; Sheinkman, A. I.; Pletnev, R. N.

doi:10.1016/0022-4596(91)90186-l

Cited by 17 publications

(9 citation statements)

References 6 publications

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“…Fd3m). According to data in the literature [12,14], the Sb 5+ ions occupy position 16c of the pyrochlore structure; the oxygens reside in position 48f; and the water molecules, in position 8b. At high temperatures, the protons possess diffusion mobility [14]; at low temperatures, they localize in positions 32e and 96h to form oxonium ions with water molecules [15].…”

Section: Resultsmentioning

confidence: 99%

“…One such compound is polyantimonic acid (PAA), with the composition Sb 2 O 5 ⋅ nН 2 O (with 2 ≤ n < 4) [8]. As shown by Klestchov et al [12], cal cining PAA at 470 K leads to the formation of a Р 1 phase, Sb 2 O 5 ⋅ 2Н 2 O, whose composition remains constant in the temperature range 370-480 K. It is reasonable to expect that the Р 1 phase of PAA is also a proton conductor, but its proton conductivity has not yet been studied in detail in this temperature range.…”

Section: Introductionmentioning

confidence: 99%

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Proton conductivity of polyantimonic acid studied by impedance spectroscopy in the temperature range 370–480 K

Yaroshenko

Burmistrov

2015

Inorg Mater

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Polyantimonic acid with the composition Sb 2 O 5 ⋅ 2H 2 O has been studied by impedance spectros copy. Its dielectric permittivity, dielectric loss tangent, electric modulus, and impedance have been deter mined in a wide frequency range, from 10 to 2 × 10 6 Hz, at temperatures from 370 to 480 K. The results demonstrate that proton transport is brought about by hopping between water molecules and oxygens and is limited by grain boundaries. The activation energy for proton conduction is 42 kJ/mol.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proton conductivity of polyantimonic acid studied by impedance spectroscopy in the temperature range 370–480 K

Yaroshenko

Burmistrov

2015

Inorg Mater

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“…The lattice cell parameter is 1.034 nm. According to the studies conducted earlier [4,7], one can suggest the following ion distribution over the crystal structure sites: the Sb 5+ ions are located in 16c sites, oxygen anions are located in 48f sites, oxo nium ions and water molecules are in 16d and 8b sites, accordingly.…”

Section: Resultsmentioning

confidence: 99%

“…According to the data of thermogravimetry, the ini tial PACA sample had the composition of H(H 3 O)Sb 2 O 6 H 2 O ⋅ 0.2H 2 O (an air dry sample) [4] and represented a uniform white powder with the coherent scattering region size of 30-50 nm.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric relaxation and protonic conductivity of polyantimonic crystalline acid at low temperatures

Yaroshenko

Burmistrov

2015

Russ J Electrochem

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The results of studies of polyantimonic crystalline acid with the composition of Sb 2 O 5 ⋅ 3.2H 2 O using the impedance spectroscopy technique at low temperatures are presented. Dependences of dielectric permittivity, slope of dielectric losses, and electric module are studied in the frequency range of 100 Hz to 2 MHz and temperature range of 220-290 K. It is shown that the limiting stage is proton transport through crystal interface. The activation energy of proton conductivity is 50.21 kJ/mol.

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Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Mendes

Kurapova

Faia

et al. 2022

J Solid State Electrochem

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Humidity sensors are in high demand for many applications, such as environmental monitoring and air and food quality control. Despite many inorganic and organic materials exhibit moisture sensing properties, the electrical response of many existing sensors is not stable along the time. Polyantimonic acid (PAA) is characterized by elevated proton conductivity and by high thermal stability: consequently, it is seen as promising proton conductor for usage in humidity sensing devices. In this work, for the first time, PAA-based bulk solid membranes were produced and tested as potential materials for relative humidity (RH) detection and their moisture sensitivity was evaluated. Two different amounts of binder were used for moulding the solid sensors: the ones with 10% of binder were designated as 90PAA, while the ones with 20% were named 80PAA. The structures of the solid samples were investigated by X-ray diffraction (XRD) technique, adsorption–desorption curves via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) techniques. The electrical behaviour was examined at ambient temperature by electrical impedance spectroscopy in the entire relative humidity (RH) interval (0–100%) and in the frequency range of 40 Hz up to 60 MHz. Electrical response of the materials was correlated with the structural features of the membranes. Both 90PAA and 80PAA sensors showed total resistance 3 × 105 and 3.5 × 105 Ω at 10% RH, respectively. A linear decrease of the resistance on RH was observed in the range 30–90% RH for both sensors. The electrical response of the evaluated PAA-based sensors displays good repeatability and reproducibility: the ones with lower binder content showed higher moisture sensitivity as well as very good time stability over 1 year.

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Composition and structure of phases formed in the process of hydrated antimony pentoxide thermolysis

Cited by 17 publications

References 6 publications

Proton conductivity of polyantimonic acid studied by impedance spectroscopy in the temperature range 370–480 K

Proton conductivity of polyantimonic acid studied by impedance spectroscopy in the temperature range 370–480 K

Dielectric relaxation and protonic conductivity of polyantimonic crystalline acid at low temperatures

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

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