We firstly report an abnormal intergrowth bismuth layer-structured phase, (Bi₃TiNbO₉)₁(Bi₄Ti₃O₁₂)₂, or BTN₁BiT₂, with non-equal parent blocks. The HRTEM analysis shows that such compound has a long-range-ordered -233- sequence. The crystal structure has been solved in orthorhombic space group A2₁am with a = 5.458 Å, b = 5.415 Å and c = 91.03 Å. Double dielectric peaks at 668 °C and 760 °C were observed. The thermal stable piezoelectric activity of d₃₃ = 11.6–13.6 pC/N up to 600 °C suggests that the BTN₁BiT₂ ceramic is a good candidate for piezoelectric device using in high temperature. This work indicates the universality of such abnormal structures and it will obviously expand Aurivillius family for future applications.

我们首先报告异常的共生铋层结构相（Bi ₃ TiNbO ₉）₁（Bi ₄ Ti ₃ O ₁₂）₂或BTN ₁ BiT ₂，其母体嵌段不相等。HRTEM分析表明这种化合物具有长程-233-序列。晶体结构已经在正交空间群A2 ₁ am中以a  = 5.458Å，b  = 5.415Å和c  = 91.03Å解析。在668°C和760°C处观察到双介电峰。d ₃₃的热稳定压电活性 在600°C时= 11.6–13.6 pC / N表示BTN ₁ BiT ₂陶瓷是高温下压电器件的理想选择。这项工作表明这种异常结构的普遍性，显然将扩大Aurivillius系列，以供将来使用。