In:
Chemistry – A European Journal, Wiley, Vol. 26, No. 42 ( 2020-07-27), p. 9330-9337
Abstract:
The reaction mechanisms, phase development and kinetics of the hydrothermal synthesis of hexagonal‐YMnO 3 from Y 2 O 3 and Mn 2 O 3 using in situ X‐ray diffraction are reported under different reaction conditions with temperatures ranging from 300 to 350 °C, and using 1, 5 and 10 m KOH, and 5 m NaOH mineraliser. Reactions initiated with Y 2 O 3 hydrating to Y(OH) 3 , which then dehydrated to YO(OH). Higher temperatures and KOH concentrations led to faster, more complete dehydrations. However, 1 m KOH led to YO(OH) forming concurrently with Y(OH) 3 before Y(OH) 3 fully dehydrated but yielded a very low phase purity of hexagonal‐YMnO 3 . Using NaOH mineraliser, no YO(OH) was observed. Dehydration also initiated at a higher temperature in the absence of Mn 2 O 3 . The evolution of Rietveld refined scale factors was used to determine kinetic information and approximate activation energies for the reaction. The described hydrothermal synthesis offers a fast, low‐temperature method for producing anisometric h‐YMnO 3 particles.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.202000528
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
1478547-X
Permalink