“…respectively. E 2 mode is a vibrational non polar optical phonon [19,20]. This mode is composed of two modes E 2 low at 108 cm -1 and E 2 (high) at 447.25 cm -1 associated with Zn lattice and oxygen atoms [21].…”
Section: O P O G R a P H Y ( 3 D I M A G E S ) O F Z N O : V P E L L mentioning
“…respectively. E 2 mode is a vibrational non polar optical phonon [19,20]. This mode is composed of two modes E 2 low at 108 cm -1 and E 2 (high) at 447.25 cm -1 associated with Zn lattice and oxygen atoms [21].…”
Section: O P O G R a P H Y ( 3 D I M A G E S ) O F Z N O : V P E L L mentioning
“…The peaks at 1150 and 1730 cm À1 are E 1 symmetry with 2LO and 3LO modes. The peak at 1101 cm À1 is A 1 and E 2 acoustic combination symmetry mode which has been reported in previous studies [24,30].…”
“…The E 2 mode which is nonpolar one is composed of two modes having a low and a high frequency. The vibration peak at 329 cm −1 is assigned to the 2E 2 mode arising from the second order Raman process [26][27][28][29][30]. Anisotropy in the force constant leads to the vibration peak at 381 cm −1 and assigned as the A 1 transverse (A 1t ) mode.…”
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