Phase transformation and size control of Mg0.1Sr0.1Mn0.8Fe2O4 nanocrystals through variation of annealing time
Source abstract
Abstract
Abstract Mg0.1Sr0.1Mn0.8Fe2O4 nanocrystals have been formerly synthesized by the one-pot and energy efficient co-precipitation strategy. In the present work Nano-spinels were divided into six portions, each portion has been annealed at 550 °C for assorted time spans; t = 4, 8, 12, 16, 20 and 25 h. The XRD investigation reveals that the structural phases of these nanocrystals have been changed from cubic spinel to Z-type hexagonal phase at t ≥ 20 h. Indeed the evolution of this transformation has begun at t = 8 h but the transition process has completely achieved at t ≥ 20 h. This transition has been imputed to Jahn-Teller deformation of Mn3+ (d4) ions, as well as to an atomic rearrangement reinforced by the existence of the comparatively large Sr2+ cations in the crystal lattice. The HRTEM images have shown that the average particle size is ranging from 35.2 to 45.62 nm in fair consistency with the crystallite size deduced from the XRD data; where the particles have exhibited agglomeration at longer time spans of annealing. It is observed that the calculated XRD and VSM parameters have been influenced by the structural conversion phenomenon related in turn to the time of annealing.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Ferroelectric and Piezoelectric Materials · Multiferroics and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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