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Title: Study of Ti{sup 4+} substitution in ZrW{sub 2}O{sub 8} negative thermal expansion materials

Abstract

Powder XRD-analysis and thermo-mechanical analysis on sintered TiO{sub 2}-WO{sub 3}-ZrO{sub 2} mixtures revealed the formation of Zr{sub 1-x}Ti{sub x}W{sub 2}O{sub 8} solid solutions. A noticeable decrease in unit cell parameter 'a' and in the order-disorder transition temperature could be seen in the case of Zr{sub 1-x}Ti{sub x}W{sub 2}O{sub 8} solid solutions. Studies performed on other ZrW{sub 2}O{sub 8} solid solutions have attributed an increase in phase transition temperature to a decrease in free lattice volume, whereas a decrease in phase transition temperature was suggested to be due to the presence of a more disordered state. Our studies indicate that the phase transition temperature in our materials is strongly influenced by the bond dissociation energy of the substituting ion-oxygen bond. A decrease in bond strength may compensate for the effect of a decrease in lattice free volume, lowering the phase transition temperature as the degree of substitution by Ti{sup 4+} increases. This hypothesis is proved by differential scanning calorimetry. - Graphical abstract: This study indicates that the phase transition temperature in our materials Zr{sub 1-x}Ti{sub x}W{sub 2}O{sub 8} is strongly influenced by the bond dissociation energy of the substituting ion-oxygen bond. A decrease in bond strength may compensate for the effectmore » of a decrease in lattice-free volume, lowering the phase transition temperature.« less

Authors:
 [1]; ;  [2];  [1]
  1. Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281 S-3, B-9000 Ghent (Belgium)
  2. Faculty of Applied Engineering Sciences, University College Ghent, Schoonmeersstraat 52, B-9000 Ghent (Belgium)
Publication Date:
OSTI Identifier:
21043809
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 180; Journal Issue: 8; Other Information: DOI: 10.1016/j.jssc.2007.05.028; PII: S0022-4596(07)00217-4; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CALORIMETRY; DISSOCIATION ENERGY; ORDER-DISORDER TRANSFORMATIONS; OXYGEN; SOLID SOLUTIONS; THERMAL EXPANSION; TITANIUM IONS; TITANIUM OXIDES; TRANSITION TEMPERATURE; TUNGSTEN OXIDES; X-RAY DIFFRACTION; ZIRCONIUM OXIDES; ZIRCONIUM TUNGSTATES

Citation Formats

Buysser, Klaartje de, Driessche, Isabel van, Putte, Bart van de, Schaubroeck, Joseph, and Hoste, Serge. Study of Ti{sup 4+} substitution in ZrW{sub 2}O{sub 8} negative thermal expansion materials. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.05.028.
Buysser, Klaartje de, Driessche, Isabel van, Putte, Bart van de, Schaubroeck, Joseph, & Hoste, Serge. Study of Ti{sup 4+} substitution in ZrW{sub 2}O{sub 8} negative thermal expansion materials. United States. doi:10.1016/j.jssc.2007.05.028.
Buysser, Klaartje de, Driessche, Isabel van, Putte, Bart van de, Schaubroeck, Joseph, and Hoste, Serge. Wed . "Study of Ti{sup 4+} substitution in ZrW{sub 2}O{sub 8} negative thermal expansion materials". United States. doi:10.1016/j.jssc.2007.05.028.
@article{osti_21043809,
title = {Study of Ti{sup 4+} substitution in ZrW{sub 2}O{sub 8} negative thermal expansion materials},
author = {Buysser, Klaartje de and Driessche, Isabel van and Putte, Bart van de and Schaubroeck, Joseph and Hoste, Serge},
abstractNote = {Powder XRD-analysis and thermo-mechanical analysis on sintered TiO{sub 2}-WO{sub 3}-ZrO{sub 2} mixtures revealed the formation of Zr{sub 1-x}Ti{sub x}W{sub 2}O{sub 8} solid solutions. A noticeable decrease in unit cell parameter 'a' and in the order-disorder transition temperature could be seen in the case of Zr{sub 1-x}Ti{sub x}W{sub 2}O{sub 8} solid solutions. Studies performed on other ZrW{sub 2}O{sub 8} solid solutions have attributed an increase in phase transition temperature to a decrease in free lattice volume, whereas a decrease in phase transition temperature was suggested to be due to the presence of a more disordered state. Our studies indicate that the phase transition temperature in our materials is strongly influenced by the bond dissociation energy of the substituting ion-oxygen bond. A decrease in bond strength may compensate for the effect of a decrease in lattice free volume, lowering the phase transition temperature as the degree of substitution by Ti{sup 4+} increases. This hypothesis is proved by differential scanning calorimetry. - Graphical abstract: This study indicates that the phase transition temperature in our materials Zr{sub 1-x}Ti{sub x}W{sub 2}O{sub 8} is strongly influenced by the bond dissociation energy of the substituting ion-oxygen bond. A decrease in bond strength may compensate for the effect of a decrease in lattice-free volume, lowering the phase transition temperature.},
doi = {10.1016/j.jssc.2007.05.028},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 8,
volume = 180,
place = {United States},
year = {2007},
month = {8}
}