Table 3 Born effective charges (unit in e) in KNO under different compressive strains

From: Increased Curie temperature in lithium substituted ferroelectric niobate perovskite via soft polar mode enhancement

Volume (Å3)

Pressure (GPa)

K

Nb

O||

O⊥

65.41

0.05

1.14

9.75

−7.42

−1.74

64.92

1.33

1.14

9.73

−7.40

−1.74

64.43

2.72

1.14

9.72

−7.38

−1.74

63.95

4.15

1.14

9.70

−7.36

−1.74

63.47

5.64

1.14

9.69

−7.34

−1.74

63.00

7.18

1.14

9.67

−7.32

−1.74

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