摘要：铁电体是当前研究的热点材料，有着良好的光学性能，介电性能和铁电性能等，值得我们去研究。因此，这里通过对铌酸钾陶瓷进行铌酸钴钡掺杂，研究掺入量的大小以及烧结温度对其晶体结构，介电和铁电性能的影响。

本文通过传统固相反应法合成了铁电钙钛矿氧化物[KNbO3]1-x[BaCo0.5Nb0.5O3]x陶瓷（KBCNO陶瓷），分别取x=0.1、x=0.3和x=0.5来分析x的值对它的形貌、结构以及介电性能。然后对x=0.3的样品改变烧结温度，分别为1100℃，1120℃和1130℃来分析介电性能和铁电性能。通过XRD物相分析和SEM形貌分析发现随着Co3+的掺入，晶体结构由正交变为立方，晶粒尺寸基本不变，约0.6μm左右，随着掺入过多Co3+，会出现晶粒粗大相。通过对其进行铁电和介电性能测试，得到了介电性在x从0.1增加到0.5的过程中，其介电常数εr由620提高到1376的结论，这是因为在x的数值增加中，铌酸钾-铌酸钴钡晶体发生了晶格畸变，各向异性增加，故容易极化。介电常数增由1100℃增加到1130℃的过程中，介电性能也从1284增加到1376。并且x=0.3的情况下，由于晶体致密性都很好，无明显缺陷增加，所以当温度从1100℃增加到1130℃的过程中剩余极化率和矫顽电场基本不变，矫顽场都在2.5Kv/cm左右，剩余极化都在2μC/cm2左右。

关键词：铌酸钾-铌酸钴钡陶瓷 介电性能 电滞回线

Title  Research on Cobalt barium niobate doping of Potassium niobate ceramic

Abstract：Ferroelectric is the popular material of current research on material,it has a good optical properties, dielectric properties and ferroelectric properties,and it is worth to study.Therefore, the effect of the size of the incorporation and the effect of the sintering temperature on the crystal structure, dielectric and ferroelectric properties of the potassium niobate ceramics were studied by using barium niobate.In this paper, ferroelectric perovskite oxides [KNbO3] 1-x [BaCo 0.5Nb 0.5O 3] x ceramics (KBCNO ceramics) were synthesized by conventional solid-phase reaction method. Using x = 0.1, x = 0.3 and x = 0.5 To analyze the value of x for its morphology, structure and dielectric properties. The sintering temperature of x = 0.3 samples was then changed at 1100 ℃, 1120 ℃ and 1130 ℃ to analyze the dielectric properties and ferroelectric properties. By XRD phase analysis and SEM morphology analysis, it was found that with the incorporation of Co3 +, the crystal structure changed from orthorhombic to cubic, and the grain size was almost constant, about 0.6μm. With the incorporation of too much Co3 +, Coarse grain. By measuring the ferroelectric and dielectric properties of the dielectric, the dielectric constant εr is increased from 620 to 1376 in the process of increasing the dielectricity from 0.1 to 0.5, which is due to the increase in the value of x , Potassium niobate - cobalt niobate crystals have lattice distortion, anisotropy increased, it is easy to polarize. The dielectric constant increased from 1100 ℃ to 1130 ℃ in the process, the dielectric properties from 1284 to 1376. And x = 0.3, since the crystal density is very good, no significant defects increase, so when the temperature from 1100 ℃ increased to 1130 ℃ in the process of residual polarization and coercivity is basically the same, coercive field are At about

2.5Kv / cm, the remnant polarization is about 2μC / cm2.

Keywords Dielectric properties Hysteresis loop Ferroelectric properties

目 次

1 引言 8

1.1 铁电陶瓷