SrBi 4 Ti 4O 15 ceramics samples with different Bi content of which mole radio, n (Sr): n (Bi): n (Ti):,is 1:4(1+x):4(x=-0.05,0,0.05,0.10,0.15,0.20),are prepared by solid-state reaction method.Their structure is analy...SrBi 4 Ti 4O 15 ceramics samples with different Bi content of which mole radio, n (Sr): n (Bi): n (Ti):,is 1:4(1+x):4(x=-0.05,0,0.05,0.10,0.15,0.20),are prepared by solid-state reaction method.Their structure is analyzed by X-ray diffraction,and their dielectricity and ferroelectricity are measured.Results show that pure SrBi 4 Ti 4O 15 pahase exists in the samples whith x=0.05 and 0.10.The sintered ceramics with x=0.05 have good ferroelectric and dielectric properties:The remnant polarization (2 P r) and coercive field ( E c) are 2.86×10 -9 C·m -2 and 8.65×10 6V·m -1 .The dielectric constant (ε r) changes litter in the range from 1 kHz to 4MHz,and ε r is 425 at the frequency of 1 MHz.展开更多
Neodymium-doped strontium bismuth titanate （SrBi4-xNdxTi4O15） ferroelectric thin films were fabricated using the sol-gel method on Pt/Ti/SiO2/Si substrates. The influence of Nd content on the microstructure and ferr...Neodymium-doped strontium bismuth titanate （SrBi4-xNdxTi4O15） ferroelectric thin films were fabricated using the sol-gel method on Pt/Ti/SiO2/Si substrates. The influence of Nd content on the microstructure and ferroelectric properties of SrBi4-xNdxTi4O15 thin films were systematically studied. The results indicated that the SrBi3.88Nd0.12Ti4O15 （SBNT0.12） thin films had better ferroelectric properties, with a remanent polarization of （2Pr） of 34.3 μC/cm^2 and a coercive field （2Ec） of 220 kV/cm. This could be attributed to the fact that SBNT0.12 ferroelectric thin films consisted of more and larger ball-like grains, approximately 150-200 nm, with structure distortion, which greatly contributed to the improvement of the ferroelectric properties of the films. Furthermore, the film exhibited a good fatigue resistant property. The value of 2Pr after 10^10 switching cycles did not change significantly. The SrBi3.88Nd0.12Ti4O15 films were promising candidates for the application of FeRAMs.展开更多
文摘SrBi 4 Ti 4O 15 ceramics samples with different Bi content of which mole radio, n (Sr): n (Bi): n (Ti):,is 1:4(1+x):4(x=-0.05,0,0.05,0.10,0.15,0.20),are prepared by solid-state reaction method.Their structure is analyzed by X-ray diffraction,and their dielectricity and ferroelectricity are measured.Results show that pure SrBi 4 Ti 4O 15 pahase exists in the samples whith x=0.05 and 0.10.The sintered ceramics with x=0.05 have good ferroelectric and dielectric properties:The remnant polarization (2 P r) and coercive field ( E c) are 2.86×10 -9 C·m -2 and 8.65×10 6V·m -1 .The dielectric constant (ε r) changes litter in the range from 1 kHz to 4MHz,and ε r is 425 at the frequency of 1 MHz.
基金the National Natural Science Foundation of China (60471042)the Natural Science Foundation of Shandong Province (Y2007F36)
文摘Neodymium-doped strontium bismuth titanate （SrBi4-xNdxTi4O15） ferroelectric thin films were fabricated using the sol-gel method on Pt/Ti/SiO2/Si substrates. The influence of Nd content on the microstructure and ferroelectric properties of SrBi4-xNdxTi4O15 thin films were systematically studied. The results indicated that the SrBi3.88Nd0.12Ti4O15 （SBNT0.12） thin films had better ferroelectric properties, with a remanent polarization of （2Pr） of 34.3 μC/cm^2 and a coercive field （2Ec） of 220 kV/cm. This could be attributed to the fact that SBNT0.12 ferroelectric thin films consisted of more and larger ball-like grains, approximately 150-200 nm, with structure distortion, which greatly contributed to the improvement of the ferroelectric properties of the films. Furthermore, the film exhibited a good fatigue resistant property. The value of 2Pr after 10^10 switching cycles did not change significantly. The SrBi3.88Nd0.12Ti4O15 films were promising candidates for the application of FeRAMs.
