EPR of ${Mn}^{2 +}$ in Fe( ${NH}_{4}$ $)_{2}$ ( ${SO}_{4}$ $)_{2}$ ⋅ ${6 H}_{2}$ O, Zn( ${NH}_{4}$ $)_{2}$ ( ${SO}_{4}$ $)_{2}$ ⋅ ${6 H}_{2}$ O, and Mg( ${NH}_{4}$ $)_{2}$ ( ${SO}_{4}$ $)_{2}$ ⋅ ${6 H}_{2}$ O: ${Mn}^{2 +}$ - ${Fe}^{2 +}$ ...

1 September 1986

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 34 (5) , 3086-3092
https://doi.org/10.1103/physrevb.34.3086

Abstract

X-band EPR measurements on

{Mn}^{2 +}

-doped single isostructural crystals of three Tutton salts M(

{NH}_{4}

)_{2}

(

{SO}_{4}

)_{2}

⋅6H

{}_{2}O

, M=Fe, Zn, and Mg, have been made at room, liquid-nitrogen, and liquid-helium temperatures. A least-squares fitting method, employing numerical diagonalization of the spin Hamiltonian matrix, fitting simultaneously a large number of resonant field line positions, has been adopted to accurately evaluate the spin Hamiltonian parameters. The intensities of lines at liquid-helium temperature have been used to determine the absolute signs of parameters. From the known shape of the paramagnetic sample (M=Fe), the

{Mn}^{2 +}

{Fe}^{2 +}

exchange interaction has been estimated to be 3.75 GHz in the paramagnetic host Fe(

{NH}_{4}

)_{2}

(

{SO}_{4}

)_{2}

⋅6H

{}_{2}

O, using the g shift in the paramagnetic from that in the diamagnetic hosts (M=Zn, Mg).

Keywords

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EPR of Mn2+ in Fe(NH4)2(SO4)2⋅6H2O, Zn(NH4)2(SO4)2 ⋅6H2O, and Mg(NH4)2(SO4)2⋅6H2O: Mn2+-Fe2+...

Abstract

Keywords

EPR of ${Mn}^{2 +}$ in Fe( ${NH}_{4}$ $)_{2}$ ( ${SO}_{4}$ $)_{2}$ ⋅ ${6 H}_{2}$ O, Zn( ${NH}_{4}$ $)_{2}$ ( ${SO}_{4}$ $)_{2}$ ⋅ ${6 H}_{2}$ O, and Mg( ${NH}_{4}$ $)_{2}$ ( ${SO}_{4}$ $)_{2}$ ⋅ ${6 H}_{2}$ O: ${Mn}^{2 +}$ - ${Fe}^{2 +}$ ...