Lattice dynamical investigations for Raman and infrared frequencies of Te doped Bi1-xTa1-xTe2xO4; 0<or=x<or=0.2.
We have applied short range force constant model and used normal coordinate analysis based on G-F matrix method in investigating for Raman and infrared modes in Te doped Bi1-xTa1-xTe2xO4; 0<or=x<or=0.2 in its orthorhombic phase. The zone centre phonons calculations is made by using six stretching and seven bending force constants in its orthorhombic phase having space group Pnna with four formula units. All zone centre modes have been assigned in this calculation for the first time. The calculated Raman and infrared wave numbers agree satisfactorily with the available experimental results. The significant contribution of each force constant towards calculated Raman and infrared wave numbers has also been made through investigating the potential energy distribution. The Te-atom is present in equal amount at Bi and Ta site in this compound. The role of tellurium atom is exhibiting one mode behaviour in the ternary compound Bi1-xTa1-xTe2xO4 (0<or=x<or=0.2).
Department of Physics, Sant Longowal Institute of Engineering and Technology, Longowal 148106, India.
Shaveen
S
Garg
Department of Physics, Sant Longowal Institute of Engineering and Technology, Longowal 148106, India. Electronic address: mmsinha2005@yahoo.co.in.
M M
MM
Sinha
Department of Physics, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India.
H C
HC
Gupta
D001729:Bismuth / Q000737:chemistry*; D003460:Crystallization; D008670:Metals / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013635:Tantalum / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*; D014732:Vibration
D008670:Metals; D013635:Tantalum; D013691:Tellurium; D010100:Oxygen; D001729:Bismuth
Infrared spectra; Lattice dynamics; Normal coordinates; Phonons; Raman spectra