2026/06/01 by D. N. Grishchenko, M. A. Medkov
Environmental Science · Materials Science · #Chemical Synthesis and Characterization #Nuclear materials and radiation effects #Thermal Expansion and Ionic Conductivity
paper · doi:10.1134/s003602362660084x
crossref issued 2026/06/01 · crossref published 2026/06/01 · crossref published-print 2026/06/01 · openalex publication_date 2026/06/01 · crossref published-online 2026/07/28 · crossref created 2026/07/28 · openalex created_date 2026/07/29 · openalex updated_date 2026/07/30 · crossref deposited 2026/07/31 · crossref indexed 2026/07/31
Abstract— In the present work, partial substitution of zirconium cations by magnesium has been carried out in the structure of the silicophosphate Na3Zr2Si2PO12 according to the generally accepted formula Na3 + 2yM(II)yZr2–ySi2PO12, in which charge compensation is achieved through additional Na+ ions. The dopant concentrations in the precursor have been varied in the range from 5 to 20 mol %. It has been shown that in the unit cell of Mg-doped compositions, the group of (SiO4)4– + Na+ ions is partially replaced by (PO4)3–. Silicophosphates with the structure Na3MgyZr2 – ySi2 – 2yP1 + 2yO12 are formed. Therefore, the precursor of composition Na3 + 2yM(II)yZr2 – ySi2PO12 contains excess concentrations of sodium and silicon relative to the forming Mg-substituted NASICON solid solutions. These excess amounts are responsible for changes in the crystal structure and morphology of the ceramics, namely: they increase the unit cell parameters of the crystal structure and give rise to an amorphous or impurity crystalline phase depending on the dopant concentration.