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The crystal structure of monoclinic phase [P2,/c, Z = 41 has been refined by the Rietveld analysis of X-ray powder diffraction data to studv the size and charge effects of dopant M"' on the m&-cell parameters of monoclinic Zr02-2 mol% MO,,,? solid solutions (n = 4 for M = Ce; II = 3 for M = La, Nd, Sm, Y, Er, Yb, SC ; and 12 = 2 for M = Mg and Ca). For trivalent dopant (n = 3), the unit-cell parameters a,,>, b,,,, c,, and unit-cell volume increase and p,,, decreases with an increase of dopant size. Unit-cell volume increases with increasing of dopant charge n.

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