Question A5 A metal oxide is investigated separately by X-ray and neutron diffraction. At room temperature, the unit cells obtained from the two experiments agree well, but at low temperature, the unit cell from the neutron experiment appears to be twice as big as that from the X-ray experiment. Give a likely explanation for these observations. Support your explanation with a sketch showing the unit cells observed by both methods.

Question A5 A metal oxide is investigated separately by X-ray and neutron diffraction. At room temperature, the unit cells obtained from the two experiments agree well, but at low temperature, the unit cell from the neutron experiment appears to be twice as big as that from the X-ray experiment. Give a likely explanation for these observations. Support your explanation with a sketch showing the unit cells observed by both methods.