Question 15.4: Strontium Oxide Strontium oxide (SrO), also known as stronti......

The Science and Engineering of Materials [1006415]

Strontium Oxide
Strontium oxide (SrO), also known as strontia, has the NaCl crystal structure. Write the lattice and basis description of strontium oxide.

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SrO has an FCC lattice with a basis of $O^{2–}$ (0, 0, 0) and $Sr^{2+}$ (1/2, 0, 0).
Note that SrO has a radius ratio for the ions of 1.12 Å/(1.32 Å) = 0.85. This radius ratio indicates that SrO should have the CsCl crystal structure. This example illustrates that while radius ratios provide a general guideline to indicate a likely structure for a material, the guideline is not strictly followed in nature for every crystal.

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