| 초록 |
Neutron powder diffraction data was used for crsytal structure analysis of ferroelectric Bi4-xNdxTi3O12 (BNT, x = 0, 0.25, 0.5, 0.75 and 1.0). Rietveld refinement was carried out for all samples. Decrease of a-axis lattice parameter was observed with an increase in substituted amount of Nd. Orthorhombicity, defined as 2(a-b)/(a+b), also decreased with increasing x. Based on the refinement results, spontaneous polarization alogn the a-axis was calculated, which decreased from 35.4 to 28.3, 24.8, 22.2 and 7.6 µC/cm2 with increasing x from 0 to 0.25, 0.5, 0.75 and 1.0 respectively. |
