New Phase of MnSb₂O₆ Prepared by Ion Exchange: Structural, Magnetic, and Thermodynamic Properties

Abstract

A new layered trigonal (P3̅1m) form of MnSb2O6, isostructural with MSb2O6 (M = Cd, Ca, Sr, Pb, and Ba) and MAs2O6 (M = Mn, Co, Ni, and Pd), was prepared by ion-exchange reaction between ilmenite-type NaSbO3 and MnSO4-KCl-KBr melt at 470 °C. It is characterized by Rietveld analysis of the X-ray diffraction pattern, electron microprobe analysis, magnetic susceptibility, specific heat, and ESR measurements as well as by density functional theory calculations. MnSb2O6 is very similar to MnAs2O6 in the temperature dependence of their magnetic susceptibility and spin exchange interactions. The magnetic susceptibility and specific heat data show that MnSb2O6 undergoes a long-range antiferromagnetic order with Néel temperature TN = 8.5(5) K. In addition, a weak ferromagnetic component appears below T1 = 41.5(5) K. DFT+U implies that the main spin exchange interactions are antiferromagnetic, thereby forming spin-frustrated triangles. The long-range ordered magnetic structure of MnSb2O6 is predicted to be incommensurate as found for MnAs2O6. On heating, the new phase transforms to the stable P321 form via its intermediate disordered variant.

Trigonal layered rosiaite-related antiferromagnet MnSnTeO6: ion-exchange preparation, structure and magnetic properties

“…However, smaller magnetic cations might be introduced via low-temperature ion exchange in ilmenite-type NaSbO3, and metastable rosiaite-type MSb2O6 (M = Mn, Co, Ni, and Cu) were prepared and studied. 13,14 In this work, we apply the same approach to ion exchange in Na2SnTeO6. 15 It is structurally related to but not strictly isostructural with ilmenite NaSbO3.…”

MnSb2O6‐chitosan nanocomposite: An efficient catalyst for the synthesis of coumarins via Pechmann reaction

“…Figure A showed X‐ray powder diffraction (XRD) patterns of MnSb 2 O 6 nanoparticles, which revealed 12 characteristic peaks (2θ = 16.58°, 19.40°, 22.42°, 27.69°, 30.32°, 32.58°, 35.21°, 41.05°, 46.50°, 54.03°, 61.93°, and 64.57°) . Figure B showed XRD patterns of MnSb 2 O 6 ‐chitosan nanocomposites.…”

Magnetocaloric Effect in an Antidot: The Effect of the Aharonov-Bohm Flux and Antidot Radius

“…From a fundamental point of view, the magnetocaloric effect (MCE) consists of the temperature variation of a material due to the change of a magnetic field to which it is subjected [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Nowadays the research of the MCE effect reawakens a strong interest in the scientific community again [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. We highlight the works associated with high-temperature caloric materials [ 21 ], antiferromagnetic and ferromagnetic interactions [ 8 , 15 , 29 , 30 ], heavy lanthanides [ 31 ], Fe-Rh alloys [ 32 ], among others.…”