Single crystals of lead magnesium niobate, PbMg1/3Nb2/3O₃, were studied with x-ray scattering measurements at temperatures between 10 and 350 K. The diffuse scattering around odd-integer Bragg reflections ( H+K+L0ex0ex=0ex0exodd) has a significant anisotropic component with ledges along $〈110〉$ directions. We show that the transverse optic (ferro distortion) modes whose polarizations are along 〈11̄0〉 directions are soft and responsible for the observed diffuse scattering. Upon cooling, these modes undergo a freezing process with q-dependent freezing temperatures. Below the lowest freezing temperature ( T190K) the diffuse scattering follows 1/q² law, indicating an elastically distorted, static structure.
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You et al. (1997) studied this question.
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