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Use of Boron Phosphate in the Solid‐State Preparation of Crystalline Iron(III) Phosphate and Manganese(II) Diphosphate
Author(s) -
Vasović Dušanka D.,
Stojaković Djordje R.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb05419.x
Subject(s) - chromium , manganese , chemistry , boron , phosphate , iron phosphate , solid state , nuclear chemistry , inorganic chemistry , organic chemistry
The possibility of using BPO 4 for the solid‐state preparation of crystalline phosphates of trivalent iron, manganese, and chromium has been investigated. If BPO 4 and Fe 2 O 3 are heated at 900°C, a complete conversion of BPO 4 to the quartz form of FePO 4 results after 9 h. If FeCl 3 .6H 2 O is used instead of Fe 2 O 3 , a multiphase crystalline product is obtained in which the dominant phase is the quartz form of FePO 4 . The reaction of BPO 4 with Mn 2 O 3 or MnO 2 at 830°C yields Mn 2 P 2 O 7 ; the amount of conversion of BPO 4 , to Mn 2 P 2 O 7 after 4 h is 80% (if Mn 2 O 3 is used) and 75% (if MnO 2 is used). However, the method is not successful in the preparation of phosphates of chromium: the reaction of BPO 4 and some chromium compounds yields α‐Cr 2 O 3 as the only chromium‐containing product.