They are distinct from the borophosphates where the borate is linked to a phosphate via a common oxygen atom.
The borate phosphates have a higher ratio of cations to number of borates and phosphates, as compared to the borophosphates.
[2] In the high temperature method, ingredients are heated together at atmospheric pressure.
[3] The boron flux method involves dissolving ingredients such as an ammonium phosphate and metal carbonate in an excess of molten boric acid.
[3] Borate phosphates are of research interest for their optical, electrooptical or magnetic properties.