TY - JOUR
T1 - 'Soft optical phonons' and the structure transition of bismuth titanate system doped with Nd and Sb
AU - Meng, Jinfang
AU - Zou, Guangtian
AU - Ma, Yanzhang
AU - Cui, Qiliang
N1 - Funding Information:
This project was supportedb y the National Natural ScienceF oundationo f China and by the NationalD octoralF oundationof the China Education Committee.
PY - 1994/11
Y1 - 1994/11
N2 - Raman scattering results for Bi2-xNdxTi4O11 and Bi2-xSbxTi4O11 systems show that the square of the frequency of the 'soft' phonon changes linearly with the Nd and Sb concentration for x{slanted equal to or less-than}0.3 and x{slanted equal to or less-than}0.4 respectively, and that the structure phase transition occuring at x = 0.3 and 0.4 may be associated with an instability of the 'soft' phonon. It is shown that changes in the short-range harmonic forces play an important role in the x dependence of the 'oft' phonon frequency. The phase transition pressure occurring in Bi1.8.Nd0.2Ti4O11 is 3.32 GPa.
AB - Raman scattering results for Bi2-xNdxTi4O11 and Bi2-xSbxTi4O11 systems show that the square of the frequency of the 'soft' phonon changes linearly with the Nd and Sb concentration for x{slanted equal to or less-than}0.3 and x{slanted equal to or less-than}0.4 respectively, and that the structure phase transition occuring at x = 0.3 and 0.4 may be associated with an instability of the 'soft' phonon. It is shown that changes in the short-range harmonic forces play an important role in the x dependence of the 'oft' phonon frequency. The phase transition pressure occurring in Bi1.8.Nd0.2Ti4O11 is 3.32 GPa.
UR - http://www.scopus.com/inward/record.url?scp=0542368139&partnerID=8YFLogxK
U2 - 10.1016/0921-4526(94)90291-7
DO - 10.1016/0921-4526(94)90291-7
M3 - Article
AN - SCOPUS:0542368139
SN - 0921-4526
VL - 203
SP - 186
EP - 192
JO - Physica B: Physics of Condensed Matter
JF - Physica B: Physics of Condensed Matter
IS - 1-2
ER -