Details

Autor(en) / Beteiligte

• Perova, E. R.
• Maiorov, P. A.
• Asabina, E. A.
• Pet’kov, V. I.
• Kovalskii, A. M.

Titel

Structure Formation and Thermal Expansion of M0.5+xMgxZr2–x(PO4)3 (M = Cd, Sr) Phosphates

Ist Teil von

• Inorganic materials, 2021-07, Vol.57 (7), p.741-747

Ort / Verlag

Moscow: Pleiades Publishing

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• — M 0.5+ x Mg x Zr 2– x (PO 4 ) 3 (M = Cd, Sr) phosphates have been synthesized via precipitation. In both systems, we have obtained limited solid solutions with the NaZr 2 (PO 4 ) 3 (NZP) structure (in the range 0 ≤ x  ≤ 0.6 for M = Cd and 0 ≤ x ≤ 0.5 for M = Sr). Structure refinement of SrMg 0.5 Zr 1.5 (PO 4 ) 3 by the Rietveld method has shown that the Zr 4+ and Mg 2+ cations reside on framework sites, whereas Sr 2+ ions occupy structural voids. The thermal expansion of the M 0.5+ x Mg x Zr 2– x (PO 4 ) 3 (M = Cd, Sr) phosphates has been studied by X-ray diffraction in the temperature range 173–473 K. The results demonstrate that the incorporation of the larger (Sr 2+ ) cations into voids in the NZP structure leads to a decrease in the magnitude of the axial linear thermal expansion coefficients. We have predicted and investigated a solid solution, Sr 0.7 Mg 0.2 Zr 1.8 (PO 4 ) 3 , with a nearly zero thermal expansion anisotropy (0.55 × 10 –6 K –1 ) and a small average thermal expansion coefficient (3.92 × 10 –6 K –1 ).