Schnackenberg, P. T.Pipman, J.Schmidt, V. HugoTuthill, G. F.2015-04-172015-04-171981-10"P.T. Schnackenberg, J. Pipman, V.H. Schmidt, and G.F. Tuthill, “Deuteration and pressure effects on Landau free energy expansion coefficients in RbxH2-xPO4,â€� Ferroelectrics 39, 1045-1048 (1981)0015-0193https://scholarworks.montana.edu/handle/1/8982Results are presented for undeuterated, 30% deuterated and 97% deuterated monocrystals of rubidium dihydrogen phosphate (RDP) for which the polarization was measured at various applied fields and accurately controlled temperatures within a degree above the ferroelectric transition temperature. The ferroelectric transition was found to be of second order at all deuterations. Some of these results were presented earlier.1–3ElectromagneticsPhysicsChemistryArticle