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The orthorhombic‐cubic phase transformation in PbO2 was investigated employing cubic‐anvil‐type high‐pressure apparatus combined with an energy dispersive‐type X ray diffraction system in the pressure‐temperature region to 84 kbar and 600°C. In situ X ray observations confirmed the stability of both the orthorhombic columbite‐type and the cubic fluorite‐type polymorphs of PbO2. Considering the rate of transformation, the equilibrium phase boundary between PbO2II (orthorhombic structure) and PbO2III (cubic fluorite structure) was determined as P (kbar) = 69 ‐ 0.019T(°C). A negative slope was established.
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Yagi et al. (1980) studied this question.
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