4 research outputs found
Shell Model force field for Lead Zirconate Titanate Pb(Zr<sub>1–<i>x</i></sub>Ti<sub><i>x</i></sub>)O<sub>3</sub>
We
have developed a shell model force field that reproduces the
details of the phase diagram of the PbÂ(Zr<sub>1–<i>x</i></sub> Ti<sub><i>x</i></sub>)ÂO<sub>3</sub>(PZT) solid solution
compound, including the low- and high-temperature phases of PbZrO<sub>3</sub> and PbTiO<sub>3</sub>. The developed force field supports
the temperature-induced phase transitions from cubic to low symmetry
phases over the whole composition range and additionally reproduces
the composition driven phase transitions. Indeed, the increase of
Ti content induces a phase change of PZT from rhombohedral to tetragonal
symmetry, mediated by a monoclinic phase, all in excellent agreement
with the experiments
A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature
Combining long-range magnetic order with polarity in
the same structure
is a prerequisite for the design of (magnetoelectric) multiferroic
materials. There are now several demonstrated strategies to achieve
this goal, but retaining magnetic order above room temperature remains
a difficult target. Iron oxides in the +3 oxidation state have high
magnetic ordering temperatures due to the size of the coupled moments.
Here we prepare and characterize ScFeO<sub>3</sub> (SFO), which under
pressure and in strain-stabilized thin films adopts a polar variant
of the corundum structure, one of the archetypal binary oxide structures.
Polar corundum ScFeO<sub>3</sub> has a weak ferromagnetic ground state
below 356 Kî—¸this is in contrast to the purely antiferromagnetic
ground state adopted by the well-studied ferroelectric BiFeO<sub>3</sub>
A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature
Combining long-range magnetic order with polarity in
the same structure
is a prerequisite for the design of (magnetoelectric) multiferroic
materials. There are now several demonstrated strategies to achieve
this goal, but retaining magnetic order above room temperature remains
a difficult target. Iron oxides in the +3 oxidation state have high
magnetic ordering temperatures due to the size of the coupled moments.
Here we prepare and characterize ScFeO<sub>3</sub> (SFO), which under
pressure and in strain-stabilized thin films adopts a polar variant
of the corundum structure, one of the archetypal binary oxide structures.
Polar corundum ScFeO<sub>3</sub> has a weak ferromagnetic ground state
below 356 Kî—¸this is in contrast to the purely antiferromagnetic
ground state adopted by the well-studied ferroelectric BiFeO<sub>3</sub>
A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature
Combining long-range magnetic order with polarity in
the same structure
is a prerequisite for the design of (magnetoelectric) multiferroic
materials. There are now several demonstrated strategies to achieve
this goal, but retaining magnetic order above room temperature remains
a difficult target. Iron oxides in the +3 oxidation state have high
magnetic ordering temperatures due to the size of the coupled moments.
Here we prepare and characterize ScFeO<sub>3</sub> (SFO), which under
pressure and in strain-stabilized thin films adopts a polar variant
of the corundum structure, one of the archetypal binary oxide structures.
Polar corundum ScFeO<sub>3</sub> has a weak ferromagnetic ground state
below 356 Kî—¸this is in contrast to the purely antiferromagnetic
ground state adopted by the well-studied ferroelectric BiFeO<sub>3</sub>