Independent components of the piezomoduli tensor for various boron nitride 2D nanoallotropes are calculated. The essence of the offered approximate method of calculation consisted that the effective dipolar moment of an elementary cell of 2D structure brought to unit of area was expressed through a tensor of elastic rigitities and relative deformations of a cell. It is shown that, besides well-known graphene-like boron nitride h-BN, both the other its hexagonal and tetragonal nanoallotropes possessing higher, in comparison with h-BN, piezoelectric properties can be of practical interest.

It is shown that the formation of ripples in the structure of 2D nanoallotropes of boron nitride leads to the occurrence of transverse piezo- and pyroelectric effects in them with temperature-dependent coefficients. The value of these coefficients for various 2D nanoallotropes is calculated. It has been shown that due to the low height of the ripples, the transverse piezoeffect in the considered nanoallotropes is three orders of magnitude weacker, while the pyroelectric effect is quite comparable to that in fluoragraphanes and can find practical application.