I believe that what you have in mind is the phosphate radical, PO4. While this radical appears in many compounds, it is not itself a compound.
PO43- is the phosphate ion.
The correct name for S3(PO4)2 is trisodium diphosphate.
The correct name for Sr3(PO4)2 is strontium phosphate.
The name of the compound Pb3(PO4)4 is lead(IV) phosphate.
There are at least two "magnesium phosphates", but the most common one has the formula Mg3(PO4)2.
PO43- is the phosphate ion.
The correct name for S3(PO4)2 is trisodium diphosphate.
The correct name for Sr3(PO4)2 is strontium phosphate.
Phosphate
The name of the compound Pb3(PO4)4 is lead(IV) phosphate.
the compound name for Ba3(PO4)2 is Barium Phosphate.
There are at least two "magnesium phosphates", but the most common one has the formula Mg3(PO4)2.
The name of this compound is zinc phosphide.
The ionic compound name for Mg3(PO4)2 is magnesium phosphate.
Sodium phosphate-Wikipedia.
The name is diphosphate of trimagnesium.
The compound Ca3 PO4 is called Calcium Phosphate.