Magnetic properties of M(PO₃)₃(M = Fe, Mo). A comparative neutron diffraction study

Low temperature heat capacity Study of Fe(PO3)3 and Fe2P2O7

“…The heat capacity of Fe(PO 3 ) 3 was measured by Rojo et al in 2003 using a PPMS calorimeter in their studies of the magnetic properties of M(PO 3 ) 3 (M@Fe, Mo) [28], and this is currently the only available report of the heat capacity of this iron phosphate. However, this measurement was performed within the temperature range from (1.8 to 100) K and no data have been reported for temperatures higher than 100 K. Another interesting aspect of this study is the unusual k-like transition, the shape of which is likely due to measurement errors caused by the poor thermal conductivity in the sample during the relaxation measurement.…”

Hydrothermal Synthesis and Spectroscopic and Magnetic Behavior of the Mn7(HOXO3)4(XO4)2(X=As, P) Compounds. Crystal Structure of Mn7(HOAsO3)4(AsO4)2

“…The bond angles of the cobalt-phosphate have values intermediate between those found for both manganese compounds. This fact and the anisotropy characteristic of the Co(II) ion could be responsible for the metamagnetic behavior observed in the Co (HOAsO ) (AsO ) compound (6). Finally, the superexchange pathways through the oxoanions should favor the antiferromagnetic couplings, as observed in other related compounds (21).…”

“…10080 (7) 6752 (6) 6614 (5) 10(1) O(4) 6216 (7) 6946 (6) 4911 (5) 12(1) O (5) 1325 (6) 10475 (5) 1627 (5) 8(1) O (6) 2215 (7) 6884(5) !467(4) 9(1) O (7) 4847 (7) 8977 (6) 3157 (5) 13(1) O (8) 10488 (7) 10400 (5) 6447(4) 8(1) O (9) 5391 (6) 12512 (5) 2263 (5) 9(1) O (10) 2504 (7) 5474 (5) 2325(4) 9(1) O (11) 12669 (7) 7981 (6) 4808 (5) 12(1) O (12) 7949 (7) 5738 (5) 2733 (5) The Raman spectra were recorded in the 200}3000 cm\ range, with a Nicolet 950FT spectrophotometer equipped with a neodymium laser emitting at 1064 nm. A Bruker ESP 300 spectrometer was used to record the ESR polycrystalline spectra.…”

“…At this point, the hydrothermal techniques can be an adequate synthetic method to prepare phosphates or arsenates with complex structural architectures (4, 5). During the course of our studies on the exploratory synthesis of some "rst-row transition-metal phosphates by hydrothermal methods, we have previously reported the synthesis of Co (HOPO ) (PO ) (6). This phase is a member of the M (HOPO ) (PO ) (M"Mn, Fe, Co) series of compounds reported in the literature (7}9).…”

“…This fact precluded carrying out any study on the physical properties of these materials. However, a systematic study of the hydrothermal synthetic conditions allowed us to obtain the best conditions of pressure and temperature to prepare Co (HOPO ) (PO ) as a pure phase (6). The magnetic study of this phase revealed an unusual and interesting metamagnetic behavior.…”