Pinched P–E hysteresis loops have been observed in filled tungsten bronze Ba₄Eu₂Ti₄Nb₆O₃₀, indicating the presence of novel polarization mechanisms. We investigate the evolution of polar order in filled tungsten bronze Ba₄Eu₂Ti₄Nb₆O₃₀, together with its dielectric properties over a wide temperature range, from 50 K to 773 K. The temperature dependences of the dielectric properties exhibit two low-temperature dielectric relaxations, at around 300 K (P1), and 100 K (P2), and a high temperature peak at 588 K with no frequency dispersion, indicating the ferroelectric transition temperature T _c. Pinched P–E loops are observed in the temperature range between the low temperature relaxation at P1, and the ferroelectric transition. On cooling, the pinched P–E hysteresis loops open gradually, with increasing remnant polarization (P _r). Two pairs of reversal electric fields indicate two types of polar reversal mechanisms, with an activated energy of 1.41 eV (E ₁), and 0.94 eV (E ₂), respectively. One corresponds to the field-induced transition from a nonpolar to a polar state, which dominates at a high temperature close to T _c, while the other relates to the reversal of ferroelectric domains which stabilize gradually on cooling. At temperatures below 300 K, the polarization exhibits an evident decrease, probably related to the disruption of the polar order due to the dielectric relaxation at P1.

在填充的钨青铜 Ba ₄ Eu ₂ Ti ₄ Nb ₆ O _{30 中}观察到收缩的P – E磁滞回线，表明存在新的极化机制。我们研究了填充钨青铜 Ba ₄ Eu ₂ Ti ₄ Nb ₆ O ₃₀中极性顺序的演变，连同其在 50 K 到 773 K 的宽温度范围内的介电特性。介电特性的温度依赖性表现出两种低温介电弛豫，大约在 300 K (P1) 和 100 K (P2)，和在 588 K 处有一个没有频率色散的高温峰，表明铁电转变温度T _c。在 P1 处的低温弛豫和铁电转变之间的温度范围内观察到收缩的P - E环。在冷却时，收缩的P - E磁滞回线逐渐打开，剩余极化增加（P _r）。两对反转电场表明两种极性反转机制，其活化能分别为1.41 eV ( E ₁ ) 和0.94 eV ( E ₂ )。一个对应于场诱导从非极性到极性状态的转变，在接近T _c的高温下占主导地位，而另一个与铁电畴的反转有关，铁电畴在冷却时逐渐稳定。在低于 300 K 的温度下，极化表现出明显的下降，这可能与由于 P1 处的介电弛豫导致的极性顺序中断有关。