Solid-state Optical Materials and Luminescence Properties: Poster Session
Sponsored by: ACerS Basic Science Division
Program Organizers: Yiquan Wu, Alfred University; Jas Sanghera, Naval Research Laboratory; Akio Ikesue, World-Lab. Co., Ltd; Rong-Jun Xie, Xiamen University; Mathieu Allix, Laboratoire CEMHTI; Kiyoshi Shimamura, National Institute for Materials Science; Liangbi Su, Shanghai Institute of Ceramics; Dariusz Hreniak, Institute of Low Temperature and Structure Research
Monday 5:00 PM
October 10, 2022
Room: Ballroom BC
Location: David L. Lawrence Convention Center
D-25: Crystallite Growth of Eu-doped Lanthanum Zirconate Pyrochlores Investigated via XRD Line Broadening: Petra Simonova1; Roman Skala2; Jan Mrazek3; Willi Pabst1; 1University of Chemistry and Technology, Prague; 2Institute of Geology of the Czech Academy of Sciences; 3Institute of Photonics and Electronics of the Czech Academy of Sciences
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.