溶胶—凝胶法制备掺镧钛酸铋铁电薄膜

利用溶胶-凝胶法在Si（100）及Pt/Ti/Si（100）衬底上制备了Bi3.5La0.5Ti3O12(BLT-5）铁电薄膜,研究了在不同退火条件下BLT-5薄膜的结晶性能。经650℃、30min退火处理的BLT-5铁电薄膜的矫顽场Et=67kV/cm,剩余极化强度Pt=11.2μC/cm∧2,BLT-5铁电薄膜呈现较好的抗疲劳特性,可望用于制备高容量铁电随机存取存储器。     

KOH浓度对水热合成Bi_(1.5)ZnNb_(1.5)O_7纳米粉体的影响

以KOH为矿化剂,用水热法合成了Bi1.5ZnNb1.5O7纳米粉体。结合负离子配位多面体生长基元模型,研究了KOH浓度对粉体物相、粒径和形貌的影响。结果表明:采用水热法可合成单相立方焦绿石结构的Bi1.5ZnNb1.5O7纳米粉体,粉体呈颗粒状。稳定生长基元的形成是影响粉体粒径的主要因素,受KOH浓度影响较大,但粉体形貌并不受KOH浓度的影响。当c(KOH)为1.8mol/L,于220℃水热反应24h,合成粉体粒径最小为51nm,比表面积最大为28.8m2/g。     

含铋铅粉对铅蓄电池放电性能的影响

铅粉中含有不同微量铋 ,经过试验证明能够提高电池放电性能 ,特别是对正极板影响较为明显 ,同时能够增加电池寿命 ,铅粉中含铋量在 0 0 0 4%时 ,对电池性能的各个方面为最佳     

Bi系2212相高温超导纤维的生长

本文报导采用激光加热小基座(LHPG)法生长出配比为Bi_2Sr(1.2)Ca_(1.2)Cu_2O_y和Bi_(2.1)Sr_(1.2)Ca_(1.1)Cu_2O_y的超导纤维.由x射线衍射分析、劳厄照相、扫描电镜、金相显微镜以及低温磁化率的观测,结果表明:用LHPG法可以生长出单相性好,织构取向明显、晶粒粗大的Bi系超导纤维。生长速度则是影响纤维结构和性能的重要因素。     

Electrodeposition of PbO2 and Bi–PbO2 on Ebonex

Electrodeposition of PbO2 and Bi–PbO2 on Ebonex was carried out under various conditions, and the surfaces and coating/substrate interfaces examined by SEM, XPS and SIMS. Excellent adhesion to Ebonex was obtained with both crystalline and amorphous surfaces. Low plating temperatures resulted in dark grey, bright PbO2 and black, mirror-like Bi–PbO2 surfaces. Extrapolation of electrode lifetime test data indicated corrosion rates of 716 m yr–1 for PbO2 and 158 m yr–1 for Bi–PbO2.     

Structures and Dielectric Properties of La-Substituted SrBi8Ti7O27 Ceramics

SrBi₈Ti₇O₂₇ ferroelectric ceramics with mixed Aurivillius structure were modified by La-substitution for Bi, and the dielectric properties were investigated together with the microstructure characterization. Solid solution of Sr(Bi_{1 – x} La _x )₈Ti₇O₂₇ was formed in the present ceramics for x 0.1, and (Bi,La)₄Ti₃O₁₂ secondary phase appeared at x = 0.15. For x 0.25, another phase Sr(Bi,La)₄Ti₄O₁₅ appeared, and (Bi,La)₄Ti₃O₁₂ disappeared gradually with increasing x, and vanished entirely at x = 0.35. With increasing x, both the dielectric constant and dielectric loss of the present ceramics increased firstly and reached their maximums 291 and 0.023 at 1 MHz, then decreased after x > 0.25. The temperature stable high- dielectric ceramics with low dielectric loss were created at the composition x = 0.5: = 122, tan = 0.0003 and = –619 ppm/°C at 1 MHz.     

铁粉置换沉淀海绵铋的动力学研究

从动力学角度研究了铋湿法冶金中铁粉置换沉淀海绵铋的化学反应机理，探讨了Bi^3＋初始浓度、Cl^-浓度、温度、溶液pH及搅拌速率等因素对铋置换率的影响及动力学数学模型。通过测定不同温度条件下的表观反应速度常数（点），求得浸出反应活化能为14．61kJ／mol。试验结果表明，置换反应的所有动力学数据服从一级反应速率规律，置换过程符合扩散控制机理。