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The temperature dependence of the axial lattice spacings of a pure BaTiO3 crystal, grown from a `top-seeded' TiO2-rich melt, is presented for the four phases. This behaviour is compared with that of a crystal grown using a potassium fluoride flux. The lower ferroelectric paraelectric transition temperature and the smaller lattice parameter discontinuities exhibited by the latter crystal are attributed to the incorporation of impurities from the flux.