中文摘要：

用固相烧结法制得了含铁钨青铜型铌酸盐Ba4Nd2Fe2Nb8O30陶瓷,研究了不同气氛下退火处理对其结构和性能的影响。退火前后的Ba4Nd2Fe2Nb8O30陶瓷均为单一的钨青铜相。退火没有改变其物相结构;但是退火通过调节氧空位的含量和离子有序程度明显影响到Ba4Nd2Fe2Nb8O30陶瓷的介电和铁电性能。在氮气和氧气中退火时,晶胞体积分别变小和变大。氮气下退火Ba4Nd2Fe2Nb8O30陶瓷介电常数和介电损耗均明显高于未退火和在氧气退火的样品。同时,氮气下退火的Ba4Nd2Fe2Nb8O30陶瓷无法测出室温电滞回线,而在氧气下退火样品铁电性较未退火时铁电性更明显。

英文摘要：

Fe-containing niobate Ba4Nd2Fe2Nb8O30 with tungsten bronze structure was prepared by solid state reaction method.Effects of annealing on structure and properties of the as-sintered and annealed Ba4Nd2Fe2Nb8O30 ceramics in different atmospheres were investigated,respectively.Results show that only the tungsten bronze phase is observed in both of the ceramics.Although annealing treatment does not change the phase composition,the obvious effect of annealing is observed on the dielectric and ferroelectric properties through adjusting the content of oxygen vacancies and order degree of ion distribution.Unit cell volume of the Ba4Nd2Fe2Nb8O30 ceramics shrinks or expands when annealed in N2 and O2,respectively.Both the dielectric constant and dielectric loss of the Ba4Nd2Fe2Nb8O30 ceramic annealed in N2 were obviously higher than those of the other ceramics.Moreover,no electric hysteresis loop at room temperature is observed in the Ba4Nd2Fe2Nb8O30 ceramics annealed in N2.While the ferroelectricity of the ceramics annealed in O2 is more stronger than that of the assintered one.