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THERMAL REACTIONS OF LEADHILLITE Pb4SO4(COs)2(OH)2

A. E. MILODOWSKI, D. J. MORGAN

1984enmineralogythermal analysisdecompositionlead

Abstract

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Reactions undergone by leadhillite from the type locality on heating to 1000 °C have been followed using differential thermal analysis (DTA), thermogravimetry (TG), differential scanning calorimetry (DSC), evolved gas analysis, continuous-heating X-ray diffraction (XRD), infrared spectroscopy (IR), and hot stage microscopy. Intermediate decomposition products were identified by X-ray powder photography. At 80 °C, biaxial leadhillite inverts to a uniaxial phase with properties similar to those of susannite, but this higher-temperature modification only partially reverts to the original structure on cooling, taking up to 24 hours for complete reversion. The mineral undergoes two decomposition reactions between 250 and 600 °C, forming PbO and PbCO3 during the first reaction and 4PbO·PbSO4 during the second. A solid-state reaction leads to a formation of α-2PbO·PbSO4 at 650 °C, while melting occurs above 850 °C. The reaction products are discussed in relation to the phase diagrams for the systems PbO-CO2 and PbO-PbSO4, providing insights into the thermal behavior of lead(II) minerals and their complex decomposition pathways.

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@article{def5f8b5-7f5c-402d-9a95-8afce5abefea,
  title={THERMAL REACTIONS OF LEADHILLITE Pb4SO4(COs)2(OH)2},
  author={A. E. MILODOWSKI and D. J. MORGAN},
  year={1984},
  language={en}
}
TY  - JOUR
TI  - THERMAL REACTIONS OF LEADHILLITE Pb4SO4(COs)2(OH)2
AU  - A. E. MILODOWSKI
AU  - D. J. MORGAN
PY  - 1984
LA  - en
ER  -

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