Affiliation:
1. Institut für Kristallographie, Universität zu Köln, Greinstr. 6, 50939 Köln, Germany
Abstract
Abstract
The pyroelectric effect of four isomorphic monoclinic (space group Cc), non-ferroelectric rare earth nitrates A
2
Ln(NO3)5·4H2O (A = NH4, 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 (NH4)2La(NO3)5·4H2O, (NH4)2Ce(NO3)5·4H2O, Rb2La(NO3)5·4H2O and Rb2Ce(NO3)5·4H2O, 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 Li2SO4·H2O and BiB3O6 and their temperature dependence are given.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
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