Phase Diagram in Bi<sub>4-x</sub>Gd<sub>x</sub>Ti<sub>3</sub>O<sub>12</sub>
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The temperature dependences of the dielectric constants of Bi<sub>4-x</sub>Gd<sub>x</sub>Ti<sub>3</sub>O<sub>12</sub> (BGT-$x$) single crystals ($x\leq 0.4$) were measured. It was found that the paraelectric--ferroelectric phase transition temperature near 680 °C remains almost unchanged in the concentration range of $0\leq x \leq 0.4$. Below the transition point at about 680 °C, another dielectric anomaly showing the phase transition was observed in BGT-$x$, where the transition temperature depends on the concentration $x$. We confirmed that the triggered transition from the tetragonal phase to the monoclinic phase, observed in Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub>, splits into two phase transitions with the addition of Gd cations, i.e., from the tetragonal phase to the orthorhombic phase and eventually to the monoclinic phase. The temperature-concentration phase diagram in BGT-$x$ was clarified.
- 2011-09-25
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