Sol-gel lithium borophosphates

In this paper we present sol-gel synthesis and thermal and structural chara cterization of some lithium borophosphates. The as-prepared samples are mos tly partially crystalline, and densification hear treatments at 500 degrees C cause samples to crystallize. In the phosphorus-rich part of the composi tion triangle we have lithium excess with respect to the nominal compositio n, which is likely due to the low reactivity of the phosphorus precursor. O n the boron-rich side, in contrast, lithium losses are found which probably occur during syneresis.