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4MnO

4MnO is a chemical formula denoting four units of manganese(II) oxide. It is not a standard standalone substance; in published literature it is usually encountered as a stoichiometric coefficient in a balanced equation or as part of a larger oxide material rather than as a discrete molecular species. The binary oxide MnO, the simplest manganese oxide, consists of Mn2+ and O2- in a rock-salt lattice and is an important precursor to other manganese oxides such as MnO2 and Mn2O3. MnO is typically prepared by reducing MnO2 at elevated temperature or by precipitation from manganese salts followed by heat treatment. It is antiferromagnetic below about 125 K, is a poor conductor of electricity, and is used as a precursor in ceramic and battery materials.

As a formula, 4MnO can appear when describing a mixture or a phase that contains four formula

units
of
MnO
per
unit
of
something
else,
or
when
representing
the
sum
of
four
MnO
formula
units
in
a
reaction.
It
does
not
correspond
to
a
well-defined
molecular
species
with
a
fixed
geometry
under
ambient
conditions.
In
materials
science,
Mn–O
stoichiometries
are
often
discussed
in
terms
of
overall
formula
units
such
as
MnO,
MnO2,
Mn3O4,
Mn4O5,
etc.,
where
the
exact
structure
depends
on
temperature,
pressure,
and
composition.