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Electrochromism and local order in amorphous WO/sub 3/

Journal Article:

Abstract

WO/sub 3/ films prepared under different conditions (evaporation, reactive sputtering and spraying of aqueous solutions of metatungstic acid) differ by orders of magnitude in their electrochromic sensitivity. Diffuse X-ray studies show the evaporated and sputtered films to be amorphous and to consists of a disordered network of corner sharing WO/sub 6/ octahedra. Sprayed films have different degrees of crystallinity depending on spraying conditions. From differential scanning calorimetry we conclude that the crystal water present in most films strongly affects the local order of the corner sharing octahedra. We find that crystal water not only provides a high ionic conductivity which is conditional for a fast electrochromic reaction but also stabilises electrocatalytically active surface sites for fast hydrogen or Li exchange with the adjacent electrolyte.
Publication Date:
Jun 01, 1977
Product Type:
Journal Article
Reference Number:
AIX-08-336006; EDB-78-038331
Resource Relation:
Journal Name: Appl. Phys.; (Germany, Federal Republic of); Journal Volume: 13:3
Subject:
36 MATERIALS SCIENCE; TUNGSTEN OXIDES; COLORATION; ORDER PARAMETERS; AMORPHOUS STATE; CALORIMETRY; CRYSTAL LATTICES; CRYSTALLIZATION; ELECTRIC FIELDS; FILMS; HIGH TEMPERATURE; IONIC CONDUCTIVITY; MEDIUM TEMPERATURE; OPTICAL PROPERTIES; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; SCATTERING; TRANSITION ELEMENT COMPOUNDS; TUNGSTEN COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties
OSTI ID:
5348162
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: APHYC
Submitting Site:
INIS
Size:
Pages: 231-237
Announcement Date:

Journal Article:

Citation Formats

Zeller, H R, and Beyeler, H U. Electrochromism and local order in amorphous WO/sub 3/. Germany: N. p., 1977. Web.
Zeller, H R, & Beyeler, H U. Electrochromism and local order in amorphous WO/sub 3/. Germany.
Zeller, H R, and Beyeler, H U. 1977. "Electrochromism and local order in amorphous WO/sub 3/." Germany.
@misc{etde_5348162,
title = {Electrochromism and local order in amorphous WO/sub 3/}
author = {Zeller, H R, and Beyeler, H U}
abstractNote = {WO/sub 3/ films prepared under different conditions (evaporation, reactive sputtering and spraying of aqueous solutions of metatungstic acid) differ by orders of magnitude in their electrochromic sensitivity. Diffuse X-ray studies show the evaporated and sputtered films to be amorphous and to consists of a disordered network of corner sharing WO/sub 6/ octahedra. Sprayed films have different degrees of crystallinity depending on spraying conditions. From differential scanning calorimetry we conclude that the crystal water present in most films strongly affects the local order of the corner sharing octahedra. We find that crystal water not only provides a high ionic conductivity which is conditional for a fast electrochromic reaction but also stabilises electrocatalytically active surface sites for fast hydrogen or Li exchange with the adjacent electrolyte.}
journal = {Appl. Phys.; (Germany, Federal Republic of)}
volume = {13:3}
journal type = {AC}
place = {Germany}
year = {1977}
month = {Jun}
}