Thermal behaviour of transition metal-containing zirconium phosphate

The thermal behaviour of Co(II), Ni(II) and Zn(II)-containing zirconium pho sphate of alpha type was investigated. XRPD analysis revealed that, for the samples containing Co(II) or Ni(II), the first reflection of the solid pha se is split into a doublet. In contrast, when Zn(II) is present, a single s olid phase system is formed. The thermal behaviour of the materials followe d this sequence. For the samples containing Co(II) or Ni(II), phase-transit ion processes were found and there was also a loss of crystal water, but fo r the sample containing Zn(II) there was only one endothermic effect, which corresponded to the decomposition of phosphate groups.