Table 6 Internal energies of the K1−xNaxTa1−yNbyO3 crystals.

From: Origin of giant piezoelectric effect in lead-free K1−xNaxTa1−yNbyO3 single crystals

K1−xNaxTa1−yNbyO3

Uo(eV/Å3)

Ut (eV/Å3)

ΔU = Ut  − Uo (eV/Å3)

K0.30Na0.70Ta0.37Nb0.63O3

50.7596

53.7836

3.0241

K0.36Na0.64Ta0.40Nb0.60O3

49.6940

52.4140

2.7200

K0.39Na0.61Ta0.42Nb0.58O3

49.0279

51.5945

2.5666

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