A needle-shaped BaTi 2 O 5 crystal was grown from a Ti-rich solution. The chemical composition of the crystal was analyzed by an electron probe micro-analyzer (EPMA). X-ray Weissenberg photographs were taken at room temperature (RT): the crystal is monoclinic with a =16.91 Å, b =3.94 Å, c =9.49 Å, β=103.0° and Z =6. A broad and large dielectric anomaly reaching 30,000 was observed at 430°C for the dielectric constant along the b -axis. Also, spontaneous polarization was estimated to be approximately 7 µC/cm 2 from the D - E loops at RT. Thus the crystal is a new ferroelectric substance with a high Curie temperature of 430°C and the space group C 2 at RT.
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Akishige et al. (2003) studied this question.