Question

3.4 Density measurements are often used to determine the type of defects created when impurities are dissolved in ionic crystals. If one assumes that the disso- lution of aluminum oxide (AlO3) in pure magnesium oxide (MgO) creates vacancies on the positive ion lattice, calculate the fractional change in the density of pure MgO when one weight percent of Al O, is added to it.

Answer 1

when it is added to Mao Sample then 3M9+2 replaced and one Vacconly cooled 2 Ait to charse - 3M8+2 stb chorse and hence the lattice le 2 Ait is equivalent to 3mg+2 QA1t3 enter's then 3M9+2 leaves and one Vacconly comes. (2A143 -> Busta Stor 72841 Now, Find Mots = 99+ •4 t St x6. 1 - 72 - wt of oxygen in IgM at Moo. 99.85 => 0.5% de crashed in Mass of Somble when thos is added. Since entering in lattice Coming out of lottice cleory 728y of Mgt2 replaced by 57 om Art How of. Aloor by who is 1.1. gt means in loosy of M90 14.480 is replaced by lt. et A203. 72gM replaced by Seger - 1 gh replaced by see 72 Now mass of ng present in 184 of 180 XL 6 & •6gr of M8 replaced by St. x6 grof Al Dansity Mass 7. Muss decreassed = 0.15.%. % density deneassed = 0.15%