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Synthesis, Structure and Magnetic Characterization of Two Phosphate Compounds Related with the Mineral Struvite: KNiPO 4 μ·μ6H 2 O and NaNiPO 4 μ·μ7H 2 O
Author(s) -
Trobajo Camino,
Salvadó Miguel A.,
Pertierra Pilar,
Alfonso Belén F.,
Blanco Jesús A.,
Khainakov Serguei A.,
García José R.
Publication year - 2007
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200700342
Subject(s) - isostructural , monoclinic crystal system , crystallography , struvite , tetragonal crystal system , crystal structure , chemistry , phosphate , materials science , organic chemistry
Two new phosphate compounds, KNiPO 4 ·6H 2 O and NaNiPO 4 ·7H 2 O, have been synthesized, identified and their crystal structure studied by powder X‐ray diffraction. KNiPO 4 ·6H 2 O crystallizes in the monoclinic system, with lattice parameters a = 6.8309(3) Å, b = 11.0610(4) Å, c = 6.1165(2) Å, and angle β = 91.045(2)°, volume of the unit cell V = 462.07(3) Å 3 , space group P 2 1 , and Z = 2, while NaNiPO 4 ·7H 2 O does so in the tetragonal system with a = 6.7390(2) Å, c = 10.9690(4) Å, V = 498.15(4) Å 3 , space group P 4 2 /mmc, and Z = 2. KNiPO 4 ·6H 2 O has the structure as the struvite analogue KMgPO 4 ·6H 2 O, whereas NaNiPO 4 ·7H 2 O is isostructural with the compound NaMgPO 4 ·7H 2 O. Neither material presents a magnetic order in the range of temperatures measured from 300 K down to 1.8 K.