Structural and magnetic characterization of the Mg0.2−xSrxMn0.8Fe2O4 nanoparticles

Structural phase transition of as-synthesized Sr–Mn nanoferrites by annealing temperature

“…Co-Cr-, Co-Mn-. , Mn-Ni-, Mn-Znand Cu-Al-Cr-nanoferrite samples were annealed at different temperatures and characterized by using different techniques [4][5][6][7][8][9]. The obtained results proved that the sample properties were varied with annealing temperature range.…”

Annealing effect on structural phase transition of as-synthesized Mg0.1Sr0.1Mn0.8Fe2O4 nanoparticles

“…The increase in P is attributed to the increase in D x and decrease in D. The decrease in D and drop of P and D x at 600 C is assigned to the disturbance in the crystal structure which results from the phase transition processes and to expansion of the crystal lattice. The slight increase in D at 1100 C is attributed to the densification of the samples or increase in packing [6]. The slow decrease of p may attribute to the slow decrease of D x for T !…”

“…Spinel Mg 0.1 Sr 0.1 Mn 0.8 Fe 2 O 4 nanoparticles were synthesized by the chemical co-precipitation method as reported early [6]. Five amounts of as-synthesized sample were weight as 20 g for each one.…”

“…10. Variation of stiffness constants,C 11 and C 12 , Young's modulus E, bulk modulus K and modulus of rigidity G against T. magnetic interactions [6].…”

“…The spectra were fitted to two quadrupole doublets C A and C B and/or two magnetic subspectra A and B. The sharper magnetic subspectrum A and doublet C A are assigned to Fe 3þ ions at the tetrahedral A-sites and the broader magnetic subspectrum B and doublet C B to Fe 3þ ions at the octahedral B-sites [1,2,6]. The broadness of the B-site subpattern arises from randomly distributed A-site diamagnetic Sr 2þ and/or Mg 2þ ions as the six nearest neighbors of the B-site Fe 3þ ion.…”