Evidence for the magnetoelectric effect in nickel-bromine boracite, Ni3B7O13 Br
Titel:
Evidence for the magnetoelectric effect in nickel-bromine boracite, Ni3B7O13 Br
Auteur:
Rivera, Jean-Pierre Schmid, Hans
Verschenen in:
Ferroelectrics
Paginering:
Jaargang 55 (1984) nr. 1 pagina's 295-298
Jaar:
1984-04-01
Inhoud:
A ferromagnetic/ferroelectric/ferroelastic phase, consistent with point group m'm2' and Tc(f. m.)= 17K, has been identified by measurements of the magnetoelectric coefficient α32, peak value at Tc(7 ps/m), and the ferromagnetic coercive field, Hc, versus temperature. A magnetoelectric effect persists above 17K up to ∼ 30K indicating a phase of still unknown nature. The dielectric constant ε33 is insensitive to magnetic ordering, but a striking anomaly of spontaneous polarization, →Ps, occurs in the magnetic ordering range and is attributed to a spontaneous magnetoelectric interaction. Furthermore, →Ps has its maximum value (290 nC/cm2) at TC(f. e)
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