Universität zu Köln

Ackermann, Matthias, Andersen, Lionel, Becker, Petra and Bohaty, Ladislav (2015). Pyroelectric properties of the monoclinic rare earth nitrates A(2)Ln(NO3)(5)center dot 4H(2)O (A = NH4, Rb; Ln = La, Ce). Z. Krist.-Cryst. Mater., 230 (11). S. 633 - 639. BERLIN: WALTER DE GRUYTER GMBH. ISSN 2196-7105

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Abstract

The pyroelectric effect of four isomorphic monoclinic (space group Cc), non-ferroelectric rare earth nitrates A(2)Ln(NO3)(5)center dot 4H(2)O (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 degrees, 129 degrees, 36 degrees and 40 degrees for (NH4)(2)La(NO3)(5)center dot 4H(2)O, (NH4)(2) Ce(NO3)(5)center dot 4H(2)O, Rb2La(NO3)(5)center dot 4H(2)O and Rb2Ce(NO3)(5)center dot 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 Li2SO4 center dot H2O and BiB3O6 and their temperature dependence are given.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ackermann, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Andersen, Lionel UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Petra UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohaty, Ladislav UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-388296
DOI:	10.1515/zkri-2014-1827
Journal or Publication Title:	Z. Krist.-Cryst. Mater.
Volume:	230
Number:	11
Page Range:	S. 633 - 639
Date:	2015
Publisher:	WALTER DE GRUYTER GMBH
Place of Publication:	BERLIN
ISSN:	2196-7105
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CRYSTAL-STRUCTURE; MONOHYDRATE; COEFFICIENT Multiple languages Crystallography Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38829