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The pyroelectric effect of four isomorphic monoclinic (space group  Cc ), non-ferroelectric rare earth nitrates  A  2  Ln (NO 3 ) 5 ·4H 2 O ( A  = NH 4 , Rb;  Ln  = La, Ce) was investigated in the temperature range between 100 K and 300 K, using a home-made continuous-flow cryostat for measurements of pyroelectric currents. The symmetry-allowed temperature-dependent change of orientation of the pyroelectric vector   p   within the mirror plane is unusually large, showing a rotation of   p   of 148°, 129°, 36° and 40° for (NH 4 ) 2 La(NO 3 ) 5 ·4H 2 O, (NH 4 ) 2 Ce(NO 3 ) 5 ·4H 2 O, Rb 2 La(NO 3 ) 5 ·4H 2 O and Rb 2 Ce(NO 3 ) 5 ·4H 2 O, respectively, while changing the temperature from 100 K to 300 K in each case. The pyroelectric coefficients are up to ten times larger than  p   3   of tourmaline. In addition, new data of the pyroelectric coefficients of Li 2 SO 4 ·H 2 O and BiB 3 O 6  and their temperature dependence are given.

Pyroelectric properties of the monoclinic rare earth nitrates A 2 Ln (NO 3 ) 5 ·4H 2 O ( A = NH 4 , Rb; Ln = La, Ce)