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short communications
Absolute assignment of the atomic planes of Li2GeO3 and LiGaO2 is made by ion surface scattering (ISS) and the crystallographic polarity is defined. Pyroelectric coefficients p3 and the piezoelectric constants d33 of lithium metagermanate and lithium gallate are determined. Pyroelectric and piezoelectric coefficient signs when defined on the crystallographic sign convention of the axes are negative and positive, respectively. The results are correlated with chemical etching studies.