Interferometric Study of the Microtopography Arising out of 90° Domain Walls in Single Crystals of Barium Titanate

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Abstract
The surface structure caused by 90° domain walls on barium titanate crystals in the ferroelectric tetragonal state has been studied as a function of temperature employing optical and interferometric techniques. It has been shown that the c‐domain surfaces are inclined against the a domains at an angle tan−1 (c−a)/a. The observed stepladder structure of alternating `a' and `c' domains shows head‐to‐tail coupling of the dipoles. Special cases of 90° wall configuration with head‐to‐head or tail‐to‐tail orientation have also been observed.