(a) Write the formula for the ionic solids depending on the choise of the ions fill the cavities below. I. A2+ and X- ions, 1/2 of the octahedral cavities are occupied. II. A2+ and X2- ions, 1/2 of the tetrahedral cavities are occupied. III. A3+ and X2- ions, 2/3 of the octahedral cavities are occupied. IV. A2+, B3+ and X2- ions, 1/8 of the tetrahedral cavities and 1/2 of the octahedral cavities are occupied.
(a) Write the formula for the ionic solids depending on the choise of the ions fill the cavities below.
I. A2+ and X- ions, 1/2 of the octahedral cavities are occupied.
II. A2+ and X2- ions, 1/2 of the tetrahedral cavities are occupied.
III. A3+ and X2- ions, 2/3 of the octahedral cavities are occupied.
IV. A2+, B3+ and X2- ions, 1/8 of the tetrahedral cavities and 1/2 of the octahedral cavities are occupied.
(b) The sublimation energy of the solid Na atom is +107 kJ.mol-1, the ionization energy of the Na atom is +496 kJ.mol-1, the 1st and 2nd
(c) Which type of (p- or n-type) semiconductors are formed by the addition of Al and P to Ge. Explain and draw the related schemes (Al:13, P:15, Ge:32).
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