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Simultaneous accommodation of Dy 3+ at the lattice site of β‐ Ca 3 (PO 4 ) 2 and t ‐ZrO 2 mixtures: Structural stability, mechanical, optical, and magnetic features
Author(s) -
Nandha Kumar Ponnusamy,
Subramanian Shangavi,
Vijayalakshmi Uthirapathy,
Kannan Sanjeevi
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17056
Subject(s) - apatite , materials science , lattice (music) , saturation (graph theory) , analytical chemistry (journal) , crystallography , composite number , crystal structure , lattice constant , luminescence , mineralogy , crystallization , chemistry , diffraction , composite material , combinatorics , acoustics , physics , mathematics , optoelectronics , chromatography , organic chemistry , optics
Structurally stable β‐ Ca 3 (PO 4 ) 2 / t ‐ZrO 2 composite mixtures with the aid of Dy 3+ stabilizer were accomplished at 1500°C. The precursors comprising Ca 2+ , P 5+ , Zr 4+ , and Dy 3+ have been varied to obtain five different combinations. The results revealed the fact that complete phase transformation of calcium‐deficient apatite to β‐ Ca 3 (PO 4 ) 2 occurred only at 1300°C, whereas the evidence of t ‐ZrO 2 crystallization is obvious at 900°C. The dual occupancy of Dy 3+ at β‐ Ca 3 (PO 4 ) 2 and t ‐ZrO 2 structures was evident; however, Dy 3+ initially prefers to occupy β‐ Ca 3 (PO 4 ) 2 lattice until its saturation limit and thereafter accommodates at the lattice site of ZrO 2 . The typical absorption and emission behavior of Dy 3+ were noticed in all the systems and, moreover, the surrounding symmetry of Dy 3+ domains has been determined from the luminescence study. All the systems ensured paramagnetic response that is generally contributed by the presence of Dy 3+ . A gradual increment in the phase content of t ‐ZrO 2 in the composite mixtures ensured a significant improvement in the hardness and Young's modulus of the investigated compositions.