王森
,
纪箴
,
黄运华
,
顾友松
,
周成
,
张跃
功能材料
研究了V2O5与Y2O3共掺杂对BaTi0.85Zr0.15O3(BTZ)陶瓷结构和性能的影响.发现适量的V2O5掺杂与Y2O3共同作用,在保证较高常温介电常数的情况下,使材料的介温曲线更加平缓,移峰作用明显.通过控制二者的含量,可以在1280℃烧出结构致密、介电性能和绝缘性能良好的陶瓷材料.Y2O3能够促进材料烧结,提高材料的烧成收缩.在还原气氛烧成的条件下,部分V5+可以进入钛酸钡晶格,起到受主掺杂的功效,中和材料中的自由电子,增加V2O5掺杂的数量可以有效地提高材料的绝缘电阻.
关键词:
BTZ
,
掺杂
,
介温曲线
,
介电常数
Huarui XU
,
Huaiying ZHOU
,
Aibing YU
材料科学技术（英）
The synthesis of nanosized, homogeneous Ba(Ti0.8Zr0.2)O3 (BTZ) powders from cheap raw materials BaCl2, TiCl4, and ZrOCl2 can be achieved by a simple precipitation process operated at a temperature less than 100℃. Characterization via scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analysis confirms that the as-prepared powder is ~100 nm with a narrow size distribution. It is also well dispersed because the particle size from SEM observation is almost the same as from BET calculation. Characterization via powder X-ray diffraction (XRD) confirms that the phase of the as-precipitated powder is not the simple mixture of BaTiO3 and BaZrO3 phases but is clearly crystallized as monophasic Ba(Ti0.8Zr0.2)O3 (BTZ) and no other phases have been detected, although the initial concentration ratio of [BaCl2]/[TiCl4+ZrOCl2] varies from 1.0 to 2.0. The dielectric behavior of as-prepared BTZ powder is then investigated and it is found that the change in the dielectric constant during the tested temperature does not exceed 30% and with very low dissipation factor. So, the as-prepared BTZ powder is suitable for MLCC.
关键词:
BTZ
,
null
,
null
