Pyroelectric properties of the monoclinic rare earth nitrates A2Ln(NO3)5•4H2O (A = NH4, Rb; Ln = La, Ce)

被引：3

作者：

Ackermann, Matthias ^{[1
]}

Andersen, Lionel ^{[1
]}

Becker, Petra ^{[1
]}

Bohaty, Ladislav ^{[1
]}

机构：

[1] Univ Cologne, Inst Kristallog, D-50939 Cologne, Germany

来源：

ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS | 2015年 / 230卷 / 11期

关键词：

pyroelectric effect; rare earth nitrates; Rb(2)Ln(NO3)(5)center dot 4H(2)O; (NH4)(2)Ln(NO3)(5)center dot 4H(2)O; BiB3O6; Li2SO4 center dot H2O; CRYSTAL-STRUCTURE; MONOHYDRATE; COEFFICIENT;

D O I：

10.1515/zkri-2014-1827

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

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.

引用

页码：633 / 638

页数：6

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