About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Solid-state Optical Materials and Luminescence Properties
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Presentation Title |
D-25: Crystallite Growth of Eu-doped Lanthanum Zirconate Pyrochlores Investigated via XRD Line Broadening |
Author(s) |
Petra Simonova, Roman Skala, Jan Mrazek, Willi Pabst |
On-Site Speaker (Planned) |
Petra Simonova |
Abstract Scope |
RE-doped lanthanum zirconate pyrochlores are promising candidates for applications requiring luminescence in the IR-range. In a new project funded by the Czech Science Foundation (GA22-14200S) we are investigating the possibility of preparing these ceramic materials in bulk form via spark plasma sintering (SPS) from nanocrystalline powders prepared via sol-gel processing. With respect to the fact that the size of the residual pores as well as potential carbon inclusions (which may occur in SPS) are critical for the optical properties and at the same time closely related to the crystallite size, the latter should be reliably known. In this contribution, which focusses on Eu-doped lanthanum zirconate pyrochlores (Eu0.03La1.97)Zr2O7, different methods for extracting the crystallite size from XRD line broadening are compared (Scherrer equation, linear and quadratic Williamson-Hall plots and Halder-Wagner plots) and crystallite growth is studied as a function of the calcination temperature. |