Thermal behavior of ferric selenite hydrates (Fe2(SeO3)3·3H2O, Fe2(SeO3)3·5H2O) and the water content in the natural ferric selenite mandarinoite

Holzheid, Astrid; Charykova, M. V.; Кривовичев, В. Г.; Ledwig, Brendan; Фокина, Е. Л.; Poroshina, Ksenia L.; Platonova, N. V.; Gurzhiy, Vladislav V.

doi:10.1016/j.chemer.2018.01.002

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Detailed description of synthesis technique of analogues of mandarinoite are given in [8]. In short, powdered SeO 2 (initial weight: ∼0.207 g) and FeCl 3 •6H 2 O (∼0.331 g) dissolved in distilled water (26 mL) were mixed together.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The entire reactors were transferred to Memmert ® heating ovens at room temperature and heated up to 30 • C, inducing an autogenous pressure of 1.5 bar due to the thermal expansion of the fluid in relation to the filling rate. A synthetic analogue of mandarinoite only formed under low-hydrothermal conditions at 30 • C (see [8] for more details). Pre-run and post-run pH values were more or less constant (pre-run pH 1.03 ± 0.02; post-run pH 1.09 ± 0.03).…”

Section: Sample Preparationmentioning

confidence: 99%

“…The solid particles were filtered out, desiccated overnight, and stored in an exsiccator until further analysis. Sample recovery was 254 ± 25 mg (except for sample 9 with only 152 mg; please note sample identification is identical to [8]). As precise calorimetric determination requires a fairly large mass (in our study we used~500 mg for determination of heat capacity and 200 to 500 mg for heat of solution determination; see below for more details), synthetic analogues of mandarinoite of various runs (9,13,14,15,16) were combined and used for calorimetric investigation.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The amounts of other elements were below the detection limit, with the exception of some samples with traces of Cl, which apparently remained after synthesis with ferric chloride. A small amount of Cl (less than 0.2%) was detected in samples #10 and #11 [8]. As those samples consist of both ferric selenite hydrates, Fe 2 (SeO 3 ) 3 •3H 2 O and Fe 2 (SeO 3 ) 3 •5H 2 O, the samples were not further studied regarding the calorimetric and thermodynamic investigation.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…A single ferric selenite hydrate crystal from De Lamar silver mine was studied by Hawthorne [7], who derived the ideal formula of mineral (Fe 2 (SeO 3 ) 3 •6H 2 O) from the structure based on single-crystal X-ray precession photographs. In our recent work [8], based on XRD measurements and thermal analysis, we were able to derive Fe 2 (SeO 3 ) 3 •(6 − x)H 2 O (x = 0.0-1.0) as the formula of the hydrous ferric selenite mandarinoite. The total amount of water apparently affects the crystallinity, and possibly the stability of crystals: the lower the x value, the higher crystallinity can be expected.…”

Section: Introductionmentioning

confidence: 99%

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A Calorimetric and Thermodynamic Investigation of the Synthetic Analogue of Mandarinoite, Fe2(SeO3)3·5H2O

et al. 2018

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Thermophysical and thermochemical calorimetric investigations were carried out on the synthetic analogue of mandarinoite. The low-temperature heat capacity of Fe2(SeO3)3∙5H2O(cr) was measured using adiabatic calorimetry between 5.3 and 324.8 K, and the third-law entropy was determined. Using these Cp,mo(T) data, the third law entropy at T = 298.15 K, Smo, is calculated as 520.1 ± 1.1 J∙K–1∙mol–1. Smoothed Cp,moT values between T → 0 K and 320 K are presented, along with values for Smo and the functions [HmoT-Hmo0] and [ΦmoT-Φmo0]. The enthalpy of formation of Fe2(SeO3)3∙5H2O(cr) was determined by solution calorimetry with HF solution as the solvent, giving ΔfHmo(298 К, Fe2(SeO3)3∙5H2O, cr) = –3124.6 ± 5.3 kJ/mol. The standard Gibbs energy of formation for Fe2(SeO3)3∙5H2O(cr) at T = 298 K can be calculated on the basis on ΔfHmo(298 К) and ΔfSmo(298 К): ΔfGmo(298 К, Fe2(SeO3)3∙5H2O, cr) = ‒2600.8 ± 5.4 kJ/mol. The value of ΔfGm for Fe2(SeO3)3·5H2O(cr) was used to calculate the Eh–pH diagram of the Fe–Se–H2O system. This diagram has been constructed for the average contents of these elements in acidic waters of the oxidation zones of sulfide deposits. The behaviors of selenium and iron in the surface environment have been quantitatively explained by variations of the redox potential and the acidity-basicity of the mineral-forming medium. These parameters precisely determine the migration ability of selenium compounds and its precipitation in the form of solid phases.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Calorimetric and Thermodynamic Investigation of the Synthetic Analogue of Mandarinoite, Fe2(SeO3)3·5H2O

et al. 2018

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Multifunctional Iron Selenate Sheath of Fe‐Based Anode Achieving High‐Rate Capacity‐Durability Combination of Aqueous Hybrid Energy Storage Devices

Song,

Fan,

Wang

et al. 2024

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The introduction of battery‐type cathode has been commonly considered a preferred approach to boost the energy density of aqueous hybrid energy storage devices (AHESDs) in alkalic systems, but AHESDs with both high energy density and power density are rare due to the great challenge in designing battery‐type anode materials with high rate and durability comparable to capacitive‐type carbon anodes. In this paper, a well‐hydrated iron selenate (FeSeO) sheath is constructed around FeOOH nanorods by a facile electrochemical activation, demonstrating the unique multifunction in fasting charge diffusion, promoting the dissociation of H2O, and inhibiting the irreversible phase transition of FeOOH to inert γ‐Fe2O3, which endow the hydrated sheath coated Fe‐based anodes with an impressive rate capability and superior durability. Thanks to the comprehensive performance of this Fe‐based anode, the assembled AHESD delivered a high energy density of 117 Wh kg−1 with the extraordinary durability of almost 100% capacity retention after 40 000 cycles. Even at an ultrahigh power density of 27 000 W kg−1, an impressive energy density of 65 Wh kg−1 can be achieved, which rivals previously reported energy‐storage devices.

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Vacancies boosting strategy enabling enhanced oxygen evolution activity in a library of novel amorphous selenite electrocatalysts

Zhang

et al. 2021

Applied Catalysis B: Environmental

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Thermal behavior of ferric selenite hydrates (Fe2(SeO3)3·3H2O, Fe2(SeO3)3·5H2O) and the water content in the natural ferric selenite mandarinoite

Cited by 8 publications

References 15 publications

A Calorimetric and Thermodynamic Investigation of the Synthetic Analogue of Mandarinoite, Fe2(SeO3)3·5H2O

A Calorimetric and Thermodynamic Investigation of the Synthetic Analogue of Mandarinoite, Fe2(SeO3)3·5H2O

Multifunctional Iron Selenate Sheath of Fe‐Based Anode Achieving High‐Rate Capacity‐Durability Combination of Aqueous Hybrid Energy Storage Devices

Vacancies boosting strategy enabling enhanced oxygen evolution activity in a library of novel amorphous selenite electrocatalysts

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