In an attempt to understand the origin of relaxor ferroelectricity, it is shown that interesting behaviour of the onset of non-ergodicity and of precursor nanodomains found in first principles simulations of the relaxor alloy $mathrm {Ba(Zr}_{1-x}mathrm{Ti}_{x}mathrm{)O}_3$ can be understood easily by a simple mapping to a soft pseudo-spin glass.
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