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Investigation of the Alkaline Earth Phosphates: Synthesis and Crystal Structure of a New Strontium Hydrogen Phosphate Form

✍ Scribed by Lotfi Ben Taher; Leila Smiri; Yvon Laligant; Vincent Maisonneuve

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
333 KB
Volume
152
Category
Article
ISSN
0022-4596

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✦ Synopsis

The hydrothermal synthesis, initial characterization (EDX analysis, IR, X-ray powder pattern), and X-ray single-crystal structure are reported for a new form of strontium hydrogen phosphate ( -SrHPO 4 ). The cell is orthorhombic, space group Pbca (No. 61) with a ‫؍‬ 8.131(3) A > , b ‫؍‬ 9.258(5) A > , c ‫؍‬ 18.084(7) A > , V ‫؍‬ 1361.31(2) A > 3 , and Z ‫؍‬ 16. The structure was determined from 1272 observed re6ections to a 5nal R value of 0.039. The atomic arrangement consists of two kinds of anionic layers (P(1) and P( 2)) lying parallel to (001), formed by closed dimers and in5nite chains of H-bonded HPO 2؊ 4 groups, respectively. These sheets are linked to each other via Sr 2Ψ‰ cations. Comparison to the crystal structure of CaBa(HPO 4 ) 2 is also given, the two compounds exhibiting the same arrangement.

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