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The structural relatiion between MoO3-type and ReO3-type is clarified by considering layers of anions parallel to (13
)MoO3 and (111)ReO3. MoO3 is then seen to be approximately cubic close-packed anions while ReO3 is cubic close-packed anions but with one-quarter of the anion sites unoccupied. The two structures may then be interconverted by a rotation operation resembling that which links ReO3- and PdF3-type structures. Photographs of ball models are used to illustrate the relations. No compounds are known which exhibit direct transition from ReO3-type to either MoO3- or PdF3-type. This is probably because of the large change in volume per anion. The interface between ReO3 and the close packed structures may be described as a dilation fault.
)MoO3 and (111)ReO3. MoO3 is then seen to be approximately cubic close-packed anions while ReO3 is cubic close-packed anions but with one-quarter of the anion sites unoccupied. The two structures may then be interconverted by a rotation operation resembling that which links ReO3- and PdF3-type structures. Photographs of ball models are used to illustrate the relations. No compounds are known which exhibit direct transition from ReO3-type to either MoO3- or PdF3-type. This is probably because of the large change in volume per anion. The interface between ReO3 and the close packed structures may be described as a dilation fault. 
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