A black material A was prepared by heating 0.3978 g of CuO, 0.1480 g of BaCO 3

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A black material A was prepared by heating 0.3978 g of CuO, 0.1480 g of BaCO3, and 1.5069 g of La2O3 to 700 °C under N2 and rapidly cooling to room temperature. A contains 15.79% O by mass and exhibited no weight loss on heating under a flow of He. A second black material B was prepared by heating La2CuO4 to 1070 °C for 17 hours in air and then slowly cooled under flow of O2. When 20 mg of B was heated to 380 °C under flow of Ar, it lost 0.059 mg. Calculate the chemical formulae of A and B, and indicate how their electronic properties might be expected to differ from those of pure La2CuO4.

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Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt

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