Rodlike YMn(2)O(5) Powders Derived from Hydrothermal Process Using Oxygen as Oxidant

A facile approach is proposed herein to fabricate YMn(2)O(5) powders with the hydrothermal method with oxygen as an oxidant. The structure and morphology of the as-synthesized YMn(2)O(5) powders were characterized by XRD, SEM, and high-resolution transmission electron microscopy (HRTEM). The results manifested that the main factors that affected the formation of the rod-like YMn(2)O(5) structures were the stirring time, hydrothermal temperature, and hydrothermal time. The oxidation time in the air had a remarkable effect on the final product by oxidizing Mn(2+) ions to Mn(3+) ions and Mn(4+) ions. The obtained YMn(2)O(5) powder was single crystalline and possessed a nanorod morphology, where the growth direction was along the c axis. The possible formation mechanism involved a dissolution–crystallization mechanism. Under the 397 nm excitation, the Mn(4+) ions exhibited an intense orange emission at 596 nm. The energy bandgap of YMn(2)O(5) powders was 1.18 eV.