A structural transition of Ba 6 Ti 17 O 40 /BaTiO 3 interfaces from faceted to rough was induced by reducing oxygen partial pressure in the atmosphere. As the oxygen partial pressure decreased, the number densities of {111} twins and abnormal grain decreased. TEM observation showed that the twin formation was governed only by the faceting of the interface. Experimental evidence of {111} twin‐assisted abnormal growth of faceted BaTiO 3 grains was also obtained.
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Jung et al. (2004) studied this question.
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