H--JUMP DIFFUSION IN BARIUM-NITRIDE-HYDRIDE BA2NH

被引：24

作者：

ALTORFER, F

BUHRER, W

WINKLER, B

CODDENS, G

ESSMANN, R

JACOBS, H

机构：

[1] CHRISTIAN ALBRECHTS UNIV KIEL,INST MINERAL PETROG,W-2300 KIEL 1,GERMANY

[2] CEA,CNRS,LEON BRILLOUIN LAB,F-91191 GIF SUR YVETTE,FRANCE

[3] UNIV GESAMTHSCH SIEGEN,W-5900 SIEGEN 21,GERMANY

[4] UNIV DORTMUND,FACHBEREICH CHEM,W-4600 DORTMUND 50,GERMANY

来源：

SOLID STATE IONICS | 1994年 / 70卷 / pt 1期

关键词：

701.1 Electricity: Basic Concepts and Phenomena - 708.2 Conducting Materials - 801.4 Physical Chemistry - 804.2 Inorganic Compounds - 921 Mathematics - 933.1.1 Crystal Lattice;

D O I：

10.1016/0167-2738(94)90322-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Barium-nitride-hydride is one of the few documented H--ionic conductors. It crystallises in the alpha-NaFeO2-structure (space group R3mBAR) with distorted Ba-Octahedral centred alternately by H- and N3-. Neutron diffraction shows that the hydrogen ions are distributed independent of temperature over two lattice sites: 85% on (3a) and 15% on (6c). At T>525 K a sharp increase of the ionic conductivity can be observed. The diffusion process takes place by uncorrelated jumps of hydrogen ions between regular lattice sites. Using quasielastic neutron scattering techniques and a planar jump diffusion model, we were able to determine the mean residence time tau on a H--site to be tau = 20 +/- 2 ps and the diffusion constant D to be 2.1 +/- 0.3 x 10(-5) cm2/s at T = 823 K.

引用

页码：272 / 277

页数：6

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