Phase Diagram in Bi_4-xGd_xTi₃O₁₂

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• The temperature dependences of the dielectric constants of Bi_4-xGd_xTi₃O₁₂ (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 Bi₄Ti₃O₁₂, 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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