Although the Hume-Rothery rules apply strictly only to metals, the concept of similarity of cations corresponds to the complete solubility of NiO in MgO (shown in the figure below).02-Mg2+Random, substitutional solid solution of NiO inMgO. The O2- arrangement is unaffected. Thesubstitution occurs among Ni?+ and Mg2+ ions.Calculate the percent difference between cation sizes in this case.Express your answer to three significant figures.Vol AEO It vecThe percent difference is%.SubmitRequest Answer One way to determine a structural defect model (such as that shown in the figure below for a solid solution of Al2 O3 in MgO) is to make careful density measurements.O2-AP+Mg2+o VacancyA substitutional solid solution of Al½O3 in MgO is not assimple as the case of NiO in MgO. The requirement of chargeneutrality in the overall compound permits only two Al+ ionsto fill every three Mg²+ vacant sites, leaving one Mg²+vacancy.What would be the percent change in density for a 5 mol % solution of Al2 O3 in MgO (compared with pure, defect-free MgO)?Express your answer to three significant figures.TVo AEO vecThe percent change in density would be%.國

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