TY - JOUR
T1 - Role of annealing temperature on cation ordering in hydrothermally prepared zinc aluminate (ZnAl2O4) spinel
AU - Dwibedi, Debasmita
AU - Murugesan, Chinnasamy
AU - Leskes, Michal
AU - Barpanda, Prabeer
N1 - The current work is partly funded by the Department of Science and Technology (DST, Govt. of India) under the aegis of Solar Energy Research Initiative (SERI) programme (DST/TMC/SERI/FR/169). PB is grateful to the Department of Atomic Energy (DAE) for a DAE-BRNS Young Scientists Research Award (YSRA). PB is grateful to Weizmann Institute of Science for a month long visiting fellowship. This research is made possible in part by the historic generosity of the Harold Perlman Family. DD thanks the Ministry of Human Resource Development (MHRD) for financial support. DD heartily acknowledge the International Centre for Diffraction Data (ICDD) for a 2017 Ludo Frevel Crystallography Scholarship Award.
PY - 2018/2
Y1 - 2018/2
N2 - Spinels (AB(2)O(4)) form a niche class of ceramics, which is rich in structural (dis)ordering due to the inherent mixing between the constituent tetrahedral and octahedral sites. The cations (A and B) can form antisite defects under the influence of external parameters like pressure, temperature and nuclear irradiation. The current study reports the formation and evolution of disorder-order structural transition in hydrothermally prepared zinc aluminate spinel ZnAl2O4. The effect of final calcination temperature (300-900 degrees C for 9 h) on the degree of cation ordering has been investigated with powder X-ray diffraction, Raman and Al-27 solid-state NMR spectroscopy. Rietveld refinement revealed a gradual disorder to order structural transition accompanied by lower inversion parameter (i(s)) and smaller lattice parameter (a) with higher calcination temperature. It was further affirmed by Raman analysis and solid-state NMR spectroscopy probing the ZnO4 and AlO4 tetrahedra in spinel. Independent of the degree of cation ordering, nanometric particle size with high surface area was observed in ZnAl2O4 spinel.
AB - Spinels (AB(2)O(4)) form a niche class of ceramics, which is rich in structural (dis)ordering due to the inherent mixing between the constituent tetrahedral and octahedral sites. The cations (A and B) can form antisite defects under the influence of external parameters like pressure, temperature and nuclear irradiation. The current study reports the formation and evolution of disorder-order structural transition in hydrothermally prepared zinc aluminate spinel ZnAl2O4. The effect of final calcination temperature (300-900 degrees C for 9 h) on the degree of cation ordering has been investigated with powder X-ray diffraction, Raman and Al-27 solid-state NMR spectroscopy. Rietveld refinement revealed a gradual disorder to order structural transition accompanied by lower inversion parameter (i(s)) and smaller lattice parameter (a) with higher calcination temperature. It was further affirmed by Raman analysis and solid-state NMR spectroscopy probing the ZnO4 and AlO4 tetrahedra in spinel. Independent of the degree of cation ordering, nanometric particle size with high surface area was observed in ZnAl2O4 spinel.
UR - https://www.scopus.com/pages/publications/85032866692
U2 - 10.1016/j.materresbull.2017.10.010
DO - 10.1016/j.materresbull.2017.10.010
M3 - Article
SN - 0025-5408
VL - 98
SP - 219
EP - 224
JO - Materials Research Bulletin
JF - Materials Research Bulletin
ER -