Thermal decomposition of the hydrates of barium hydroxide

Habashy, G.M.; Kolta, G.A.

doi:10.1016/0022-1902(72)80361-0

Cited by 36 publications

(10 citation statements)

References 20 publications

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“…3) which was also reported in [21]. According to the literature, the decomposition temperature of pure Ba(OH) 2 is about 410°C [22]. It should be noticed that the amount of barium hydroxide in the samples after the test is impossible to calculate or even to estimate based on TG curve.…”

Section: Chemical Stabilitymentioning

confidence: 99%

Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Łącz

2016

Ionics

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Y-doped barium cerate BaCe 0.9 Y 0.1 O 3 − δ was synthesised by a solid-state reaction method. Materials with different average grain sizes and grain boundary surface areas were obtained. The effect of microstructure on the chemical stability in the CO 2 and H 2 O-containing atmosphere and electrical properties was analysed and discussed. To evaluate the chemical stability of BaCe 0.9 Y 0.1 O 3 − δ , the exposure test was performed. Samples were exposed to the carbon dioxide and water vapour-rich atmosphere at 25°C for 700 h. Thermogravimetry supplied by mass spectrometry was applied to analyse the samples before and after this comprehensive test. The mass loss for samples before and after the test and the amount of BaCO 3 formed during the test were directly treated as the measure of chemical instability of BaCe 0.9 Y 0.1 O 3 − δ in the atmosphere rich in carbon dioxide and water vapour. As it was observed, the BaCe 0.9 Y 0.1 O 3 − δ chemical stability towards CO 2 and H 2 O is not affected by the materials' microstructure. Electrical properties of BaCe 0.9 Y 0.1 O 3 − δ which differs with microstructure were determined using electrochemical impedance spectroscopy (EIS). It was found that the grain interior resistivity and activation energy of grain interior conductivity is microstructure independent. However, the effect on microstructure was seen on the EIS spectra in the range of grain boundary contribution. Therefore, the lowest activation energy and the highest conductivity were observed for a material with the lowest grain boundary surface area.

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Section: Chemical Stabilitymentioning

confidence: 99%

Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Łącz

2016

Ionics

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“…54 Thermal energy storage can be achieved through 3 distinct ways: sensible; latent or thermochemical 55 heat storage. Sensible heat storage relies on the material's specific heat capacity.…”

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confidence: 99%

Thermal energy storage for low and medium temperature applications using phase change materials – A review

2016

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“…The next step in the temperature range 400-600°C can be attributed to the decomposition of barium hydroxide Ba(OH) 2 or destruction of protonic defects in dry air atmosphere, as reported in literature [24,25]. According to the literature, the decomposition temperature of pure Ba(OH) 2 is about 410°C [24]. The last step in the temperatures above 800°C can be described as decomposition of secondary BaCO 3 formed during the exposition test.…”

Section: Resultsmentioning

confidence: 77%

“…The low temperature of the process suggests dehydration of material and liberation of the water absorbed on the surface and in the pores of sintered BaCeO 3-d . The next step in the temperature range 400-600°C can be attributed to the decomposition of barium hydroxide Ba(OH) 2 or destruction of protonic defects in dry air atmosphere, as reported in literature [24,25]. According to the literature, the decomposition temperature of pure Ba(OH) 2 is about 410°C [24].…”

Section: Resultsmentioning

confidence: 82%

Application of DTA-TG-MS for determination of chemical stability of BaCeO3−δ-based protonic conductors

Pasierb

Gajerski

Osiadły

et al. 2014

J Therm Anal Calorim

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Thermogravimetry (TG) and Differential Thermal Analysis (DTA) techniques coupled with mass spectrometry were applied to evaluate the chemical stability of BaCeO 3-d-based materials in the CO 2-and H 2 Orich atmosphere. The different groups of materials were investigated: solid solutions of BaCeO 3-BaTiO 3 and BaCeO 3-BaSnO 3 acceptor doped by Y or In and composite materials with nominal composition (1-x)BaCe 0.9 Y 0.1 O 3d-xYPO 4. To evaluate the chemical stability towards carbon dioxide and water vapour samples were exposed to atmosphere containing CO 2 /H 2 O (7 % of CO 2 in air, 100 % RH) at temperature of 25°C for 350 h. Thermal analysis (TG/DTA) was applied to analyse the materials before and after the test. To support the interpretation of TG/DTA results, the analysis of gaseous products evoluted during thermal treatment of the samples was provided using mass spectrometer. This combined analysis clearly shows that during the exposition test, the conversion of barium cerate to barium carbonate and barium hydroxide occurs. The amount of BaCO 3 and the degree of BaCeO 3-d conversion depend on the type of barium cerate modification. The mass loss observed after the exposition test can be treated as a measure of chemical instability of BaCeO 3d-based materials. The correlation of chemical stability, described by the mass loss, on Goldschmidt tolerance factor, describing the deviation from ideal perovskite structure, was found in most of the materials investigated. However, the influence of the microstructure and the modification the grain boundaries on the chemical stability of BaCeO 3-d-based materials cannot be neglected.

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Thermal decomposition of the hydrates of barium hydroxide

Cited by 36 publications

References 20 publications

Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Effect of microstructure on chemical stability and electrical properties of BaCe0.9Y0.1O3 − δ

Thermal energy storage for low and medium temperature applications using phase change materials – A review

Application of DTA-TG-MS for determination of chemical stability of BaCeO3−δ-based protonic conductors

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