基于Swartz and Shrout的二次合成法,采用改进的两步法,将部分原料预合成,一次烧结合成具有100%钙钛矿结构的75Pb(Zn_(1/3)Nb_(2/3))O_3-10PbTiO_3-15BaTiO_3固溶体陶瓷。首先一次性称量PbO,然后和ZnNb_2O_6混合,在660～800℃预合成,将...基于Swartz and Shrout的二次合成法,采用改进的两步法,将部分原料预合成,一次烧结合成具有100%钙钛矿结构的75Pb(Zn_(1/3)Nb_(2/3))O_3-10PbTiO_3-15BaTiO_3固溶体陶瓷。首先一次性称量PbO,然后和ZnNb_2O_6混合,在660～800℃预合成,将预合成产物粉碎后再与TiO_2和BaCO_3按化学计量称量,充分混合后,在1060～1140℃保温1～2h烧结成陶瓷试样。实验结果表明:改进的两步法工艺能够将预合成温度降为660℃,烧结温度能被拓宽到80℃获得100%钙钛矿结构的固溶体陶瓷。不同于传统的预合成和烧结,改进的两步法工艺简单、有效,在预合成阶段没有形成钙钛矿相,烧结阶段陶瓷的成瓷和致密化同时进行,完成了中间相向钙钛矿相的转变,获得了介电性能优良的陶瓷试样。展开更多
Series Bi3NbO7/Bi2Zn（2/3）Nb（4/3）O7 （BN/BZN） composites were synthesized through a facile solid state reaction method. The products were characterized by X-ray diffraction（XRD）, field emission scanning electron...Series Bi3NbO7/Bi2Zn（2/3）Nb（4/3）O7 （BN/BZN） composites were synthesized through a facile solid state reaction method. The products were characterized by X-ray diffraction（XRD）, field emission scanning electron microscopy（FE-SEM） and UV-vis diffuse reflectance spectroscopy（DRS）. When BN： BZN=0.1 mole ratio, the BN/BZN composite showed the best visible-light-driven photocatalytic performance, which decomposed nearly 100% of Rh B（10 ppm, p H=3-4） within 40 min. The results demonstrated that in-situ solid state synthesis of BN/BZN composites could be an efficient strategy to develop new photocatalyst for environmental remediation.展开更多
以固态氧化物为原料,采用固态合成工艺制备Pb(Zn1/3Nb2/3)O3-Pb(Ni1/3Nb2/3)O3-Pb(ZrTi)O3(PZN-PNN-PZT)压电陶瓷,并研究了锆钛比(r(Zr)/r(Ti))、Ba2+的A位取代及Ba2+、La3+的A位复合取代对压电陶瓷电性能的影响。结果表明,PZN-PNN-PZT...以固态氧化物为原料,采用固态合成工艺制备Pb(Zn1/3Nb2/3)O3-Pb(Ni1/3Nb2/3)O3-Pb(ZrTi)O3(PZN-PNN-PZT)压电陶瓷,并研究了锆钛比(r(Zr)/r(Ti))、Ba2+的A位取代及Ba2+、La3+的A位复合取代对压电陶瓷电性能的影响。结果表明,PZN-PNN-PZT压电陶瓷在r(Zr)/r(Ti)=1.03下,进行Ba2+,La3+的A位复合取代后,即式子在Pb0.92Ba0.04La0.04(Ni1/3Nb2/3)y(Zn1/3Nb2/3)z Zrm Tin O3时压电性能最佳,其介电常数εT33/ε0=5 657,压电常数d33=709pC/N,机电耦合系数kp=0.69,品质因数Qm=45,居里温度TC=180.9℃。展开更多
文摘基于Swartz and Shrout的二次合成法,采用改进的两步法,将部分原料预合成,一次烧结合成具有100%钙钛矿结构的75Pb(Zn_(1/3)Nb_(2/3))O_3-10PbTiO_3-15BaTiO_3固溶体陶瓷。首先一次性称量PbO,然后和ZnNb_2O_6混合,在660～800℃预合成,将预合成产物粉碎后再与TiO_2和BaCO_3按化学计量称量,充分混合后,在1060～1140℃保温1～2h烧结成陶瓷试样。实验结果表明:改进的两步法工艺能够将预合成温度降为660℃,烧结温度能被拓宽到80℃获得100%钙钛矿结构的固溶体陶瓷。不同于传统的预合成和烧结,改进的两步法工艺简单、有效,在预合成阶段没有形成钙钛矿相,烧结阶段陶瓷的成瓷和致密化同时进行,完成了中间相向钙钛矿相的转变,获得了介电性能优良的陶瓷试样。
基金Funded by the National Natural Science Foundation of China(No.51662005)the Guangxi Natural Science Foundation(No.2014GXNSFFA118004)
文摘Series Bi3NbO7/Bi2Zn（2/3）Nb（4/3）O7 （BN/BZN） composites were synthesized through a facile solid state reaction method. The products were characterized by X-ray diffraction（XRD）, field emission scanning electron microscopy（FE-SEM） and UV-vis diffuse reflectance spectroscopy（DRS）. When BN： BZN=0.1 mole ratio, the BN/BZN composite showed the best visible-light-driven photocatalytic performance, which decomposed nearly 100% of Rh B（10 ppm, p H=3-4） within 40 min. The results demonstrated that in-situ solid state synthesis of BN/BZN composites could be an efficient strategy to develop new photocatalyst for environmental remediation.
文摘以固态氧化物为原料,采用固态合成工艺制备Pb(Zn1/3Nb2/3)O3-Pb(Ni1/3Nb2/3)O3-Pb(ZrTi)O3(PZN-PNN-PZT)压电陶瓷,并研究了锆钛比(r(Zr)/r(Ti))、Ba2+的A位取代及Ba2+、La3+的A位复合取代对压电陶瓷电性能的影响。结果表明,PZN-PNN-PZT压电陶瓷在r(Zr)/r(Ti)=1.03下,进行Ba2+,La3+的A位复合取代后,即式子在Pb0.92Ba0.04La0.04(Ni1/3Nb2/3)y(Zn1/3Nb2/3)z Zrm Tin O3时压电性能最佳,其介电常数εT33/ε0=5 657,压电常数d33=709pC/N,机电耦合系数kp=0.69,品质因数Qm=45,居里温度TC=180.9℃。
