Transition Metal-Substituted Calcium Orthophosphates

This atomic arrangement results in a hexagonal skeleton of space group Ric with large structural vacancy sites per unit cell of octahedral symmetry (Ml) occupied by cations with the coordination number [6] such as titanium or zirconium and trigonal-prismatic symmetry (M2) occupied by vacancies as in Nb2(P04)3, by two-valent ions as in Ca05Ti2(PO4)3 or three-valent ions as in Lao, 33Ti2(P04)3. These vacancies account for the structural variability of the NASICON family as well as their ionic conductivity. 

Quantitative data of the electric conductivity of NASICONs in the literature are far and apart, and appear to differ considerably depending on the chemical 

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Transition Metal-Substituted Calcium Orthophosphate Coatings... 

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