Developments in Ceramic Materials Research

Synthesis, Spectroscopic and Magnetic Studies… 135
interactions between only one phosphate group exhibit an O-P-O angle of approximately 117°
favoring antiferromagnetic interactions [58] (see Table 4). The Cr-O-P angles show values
between 132-148° which are practically similar to those obtained in the M(PO3)3 (M= Cr,
Mo, Fe) metaphosphates.
P(1)
O(4)
O(5)
P(2)
O(6)
O(7)
O(4)
Cr
O(3)
O(9)
Figure 30. Schematic views of the exchange pathways for (a) Cr(PO 3) 3 and (b) Cr 2(P 6O 18).
P(1)
P(3)
O(8)
O(2)
P(3)
O(2)
P(1)
O(3)
O(8)
O(9)
O(4)
O(7)
P(2)
Cr
O(6)
O(5)
O(4)
P(1)