Table 3 The calculated frequency (cm−1) of zone-center optical phonon modes of ilmenite (IL)-type ZnTiO3 (space group \(R\overline{3}\)).

From: First-principles investigation of the ferroelectric, piezoelectric and nonlinear optical properties of LiNbO3-type ZnTiO3

Au

Ag

Eu

Eg

182.88

137.31

187.49

172.99

368.25

213.20

267.39

248.74

469.14

356.79

387.31

309.73

660.88

442.07

481.90

453.06

 

678.17

 

578.94

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