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Thermal stability of nano Ce 1−x Ti x O 2 material system for X < 0.2
Author(s) -
Mordekovitz Yuval,
Shelly Lee,
Hayun Shmuel
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16523
Subject(s) - thermal stability , materials science , solubility , nano , chemical engineering , phase (matter) , work (physics) , nanotechnology , mineralogy , thermodynamics , chemistry , composite material , organic chemistry , physics , engineering
Ceria (CeO 2 ) is a technologically promising compound due to a remarkable set of properties. However, the use of ceria also has drawbacks, the most pronounced of which is the material's poor thermal stability. This property limits the use of ceria‐based materials at elevated temperatures, in many technological applications. To overcome this, the addition of TiO 2 is proposed. Such addition essentially creates a new material system, namely Ce 1−x Ti x O 2 . In this work, an array of techniques were employed to determine the thermal stability of this new compound range ( X < 0.2). Results show that when nano‐sized, TiO 2 is fully soluble in CeO 2 in this range. After heat treatment, however, the material coarsens and the solubility limit decreases to less than 2 at.%. as the compound undergoes significant changes. These include solute segregation and phase separation. Finally, the factors that affect compound stability are discussed.