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The TiO 2 ‐rich side of the system PbO‐TiO 2 was investigated by X‐ray diffraction techniques, and a new compound PbTi 3 O 7 was found. It has a bimolecular monoclinic unit Cell with a = 10.732 A, b = 3.812 A, c = 6.578 A, and β= 98° 05′. The PbTi 3 O 7 decomposes into PbTiO s and rutile at temperatures above 850°C. The overall decomposition proceeds according to first‐order kinetics with an apparent activation energy of about 170 kcal mole ‐1 .
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K. Aykan (1968) studied this question.
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