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Publisher DOI: 10.1002/ppsc.201600069
Title: High-temperature stable Zirconia particles doped with Yttrium, Lanthanum, and Gadolinium
Language: English
Authors: Leib, Elisabeth 
Pasquarelli, Robert M. 
Blankenburg, Malte 
Müller, Martin 
Schreyer, Andreas 
Janßen, Rolf 
Weller, Horst 
Vossmeyer, Tobias 
Issue Date: 2016
Publisher: WILEY-VCH
Source: Particle & Particle Systems Characterization 9 (33): 645-655 (2016)
Journal or Series Name: Particle & Particle Systems Characterization 
Abstract (english): Zirconia microspheres synthesized by a wet-chemical sol–gel process are promising building blocks for various photonic applications considered for heat management and energy systems, including highly effi cient refl ective thermal barrier coatings and absorbers/emitters used in thermophotovoltaic systems. As previously shown, pure zirconia microparticles deteriorate at working temperatures of ≥1000 °C. While the addition of yttrium as a dopant has been shown to improve their phase stability, pronounced grain growth at temperatures of ≥1000 °C compromises the photonic structure of the assembled microspheres. Here, a new approach for the fabrication of highly stable ceramic microparticles by doping with lanthanum, gadolinium, and a combination of those with yttrium is introduced. The morphological changes of the particles are monitored by scanning electron microscopy, ex situ X-ray diffraction (XRD), and in situ high-energy XRD as a function of dopant concentration up to 1500 °C. While the addition of lanthanum or gadolinium has a strong grain growth attenuating effect, it alone is insuffi cient to avoid a destructive tetragonal-to-monoclinic phase transformation occurring after heating to >850 °C. However, combining lanthanum or gadolinium with yttrium leads to particles with both effi cient phase stabilization and attenuated grain growth. Thus, ceramic microspheres are yielded that remain extremely stable after heating to 1200 °C.
DOI: 10.15480/882.1669
ISSN: 09340866
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
Project: SFB 986: Teilprojekt C5 - Oxidische Hochtemperatur-Schutzschichtsysteme mittels angepasster Porenstruktur 
License: In Copyright In Copyright
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