The experimental and theoretical investigation of vibration spectra in ferroelectric semiconductor SbSBrxI1−x crystals

✍ Scribed by A. Audzijonis; L. Žigas; A. Kvedaravičius; R. Žaltauskas

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 455 KB
• Volume: 404
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2009.07.162

✦ Synopsis

The vapor grown SbSBr x I 1Àx (x ¼ 0.1; 0.5; 0.9) crystals with clear mirror surfaces have been used for infrared reflection measurements with Fourier spectrometer. The vibration frequencies along c(z)-axis have been derived from Kramers-Kroning and optical parameters fitting analysis of the experimental reflectivity spectra at T ¼ 300 K. The theoretical vibration spectra of SbSBr x S 1Àx (x ¼ 0.1; 0.5; 0.9) crystals in paraelectric phase (T ¼ 300 K) along c(z)-axis have been determined in quasiharmonic approximation by diagonalization of dynamical matrix. The theoretical vibration spectra of these crystals in a-b(xÀy) plane have been determined in harmonic approximation. In this work we discuss the nature of anharmonism in SbSBr x I 1Àx crystals along the c(z)-axis.