Étude par analyse thermique différentielle, échappement de radon et radiocristallographie, de la décomposition thermique de bioxydes de plomb β de texture différente

Fouque, Daniel; Fouilloux, P.; Bussiere, P.; Weigel, D.; Prettre, Marcel

doi:10.1051/jcp/1965621088

Cited by 15 publications

(3 citation statements)

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“…Recent investigations (15)(16)(17) on the thermal properties of the lead-oxygen system have shown that only two distinct oxide phases exist between PbO1.9o and Pb304. These intermediate oxides, designated a-PbOx and /~-PbOx by BystrSm (10), have very similar crystal structures.…”

Section: Thermal Analysis Resultsmentioning

confidence: 99%

Thermal Decomposition Mechanism of Formed and Cycled Lead Dioxide Electrodes and Its Relationship to Capacity Loss and Battery Failure

Guilder¹,

Simon²

1974

J. Electrochem. Soc.

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The structural changes accompanying capacity loss in the PbO2/PbSO4 electrode were followed using differential thermal analysis. The thermal decomposition mechanism of formed plates was found to differ, depending on the method of manufacture. All cycled plates, however, gave the same decomposition mechanism after a few cycles. The major changes in the DTA curves, as the positive electrode was cycled to failure, was the gradual disappearance of the exothermic peak at 200*C and the endothermic peak at 358~ It is believed that these peaks are associated with an electrochemically active amorphous form of PbO2. As the electrochemically active PbOs is cycled to failure it is converted to an electrochemically inactive form of PbO2. This latter form of PbO2 gives DTA results similar to those obtained on reagent PbOz. The continual conversion of electrochemically active PbO2 to the electrochemically inactive PbO2 is one of the major factors that accounts for the loss in battery capacity and ultimate failure. ElectrochemicalSociety Active Member.

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Section: Thermal Analysis Resultsmentioning

confidence: 99%

Thermal Decomposition Mechanism of Formed and Cycled Lead Dioxide Electrodes and Its Relationship to Capacity Loss and Battery Failure

Guilder¹,

Simon²

1974

J. Electrochem. Soc.

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“…device [4] and the AdamelChevenard thermobalance were used, respectively. The apparatus for simultaneous ETA and DTA was described in [5]. Experimental conditions: heating rate 5 ~ min-1; gaseous naedium pure nitrogen ("U" from L'Air Liquide) flowing at 60 ml.…”

Section: Measurementsmentioning

confidence: 99%

Thermal behaviours of barium ortho-, meta- and para-nitrobenzoates

Charbonnier

Bálek

Bussiere

1975

Journal of Thermal Analysis

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The thermal behaviours of barium ortho-, meta-and para-nitrobenzoates were studied by DTA, TG and Emanation Thermal Analysis (ETA) in the temperature range 20-300 ~ The application of ETA as a supplement to the classical thermoanalytical methods (DTA and TG) for the study of organic compounds in the solid state is demonstrated.Absolute values of emanating power, measured at room temperature for samples quenched from temperatures before and after the effects in the thermoanalytical curves, provide valuable characteristics of the intermediate products of thermal treatment, especially with regard to the degree of disorder of the molecular structure. The evolution of the molecular structure of each isomer during heating is discussed, and new X-ray patterns of the different compounds are given.Although the differences in the chemical properties of various isomers of aromatic carboxylic acids and their salts are well known in the liquid state, their behaviours in the solid state have been studied much less.The aim of this paper is to study and compare the thermal behaviours of the barium salts of ortho-, meta-and para-nitrobenzoic acids, which are solid at room temperature.Thermoanalytical investigations were carried out by means of DTA, TG, Emanation Thermal Analysis (ETA) and X-ray diffraction. ETA is a recommended method [1, 2], giving information not only about the structural changes in solids, but also about molecular structure and texture and about lattice forces of compounds in the solid state. The chemical compositions of the initial compounds and the intermediates of thermal treatment were followed by infrared spectroscopy and chemical analysis. Experimental Preparation of samplesBarium o-nitrobenzoate trihydrate Reagents: o-nitrobenzoic acid (R.G. purity) (m.p. 147~ and Ba(OH)2 9 8H20 (A.G. purity). 0.2 M o-nitrobenzoic acid was neutralized with 0.1 M barium hydroxide. The water-soluble salt formed [3] was crystallized at 3 ~ , washed with water and alcohol at 3 ~ and dried in air.

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“…The thermal decompositions of the ~-orthorhombic and fl-tetragonal phases of lead dioxide have been extensively investigated [1][2][3][4]. The various intermediates between PbO2 and PbO have been characterized, and the roles of the hydrogen and Pb(II) contents in the initial stages of decomposition have been pointed out [5][6].…”

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confidence: 99%

Effect of preliminary mechanical activation on the behaviour of orthorhombic lead dioxide

Barriga

Morales

Tirado

1988

Journal of Thermal Analysis

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Étude par analyse thermique différentielle, échappement de radon et radiocristallographie, de la décomposition thermique de bioxydes de plomb β de texture différente

Cited by 15 publications

References 0 publications

Thermal Decomposition Mechanism of Formed and Cycled Lead Dioxide Electrodes and Its Relationship to Capacity Loss and Battery Failure

Thermal Decomposition Mechanism of Formed and Cycled Lead Dioxide Electrodes and Its Relationship to Capacity Loss and Battery Failure

Thermal behaviours of barium ortho-, meta- and para-nitrobenzoates

Effect of preliminary mechanical activation on the behaviour of orthorhombic lead dioxide

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