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DOE OSTI2020

Materials Data on MgZr by Materials Project

ZrMg is beta-prime cadmium gold structured and crystallizes in the orthorhombic Pmma space group. The structure is three-dimensional. Mg is bonded to four equivalent Mg and eight equivalent Zr atoms to form MgMg4Zr8 cuboctahedra that share corners with eight equivalent ZrMg8Zr4 cuboctahedra, corners with ten equivalent MgMg4Zr8 cuboctahedra, edges with six equivalent MgMg4Zr8 cuboctahedra, edges with twelve equivalent ZrMg8Zr4 cuboctahedra, faces with eight equivalent ZrMg8Zr4 cuboctahedra, and faces with twelve equivalent MgMg4Zr8 cuboctahedra. There are two shorter (3.24 Å) and two longer (3.27 Å) Mg–Mg bond lengths. There are six shorter (3.10 Å) and two longer (3.14 Å) Mg–Zr bond lengths. Zr is bonded to eight equivalent Mg and four equivalent Zr atoms to form ZrMg8Zr4 cuboctahedra that share corners with eight equivalent MgMg4Zr8 cuboctahedra, corners with ten equivalent ZrMg8Zr4 cuboctahedra, edges with six equivalent ZrMg8Zr4 cuboctahedra, edges with twelve equivalent MgMg4Zr8 cuboctahedra, faces with eight equivalent MgMg4Zr8 cuboctahedra, and faces with twelve equivalent ZrMg8Zr4 cuboctahedra. There are two shorter (3.27 Å) and two longer (3.28 Å) Zr–Zr bond lengths.

36 MATERIALS SCIENCE↗

DOE OSTI2024

Crystal structure solution and high-temperature thermal expansion in NaZr 2 (PO 4 ) 3 -type materials

The NaZr 2 P 3 O 12 family of materials have shown low and tailorable thermal expansion properties. In this study, SrZr 4 P 6 O 24 (SrO·4ZrO 2 ·3P 2 O 5 ), CaZr 4 P 6 O 24 (CaO·4ZrO 2 ·3P 2 O 5 ), MgZr 4 P 6 O 24 (MgO·4ZrO 2 ·3P 2 O 5 ), NaTi 2 P 3 O 12 [½(Na 2 O·4TiO 2 ·3P 2 O 5 )], NaZr 2 P 3 O 12 [½(Na 2 O·4ZrO 2 ·3P 2 O 5 )], and related solid solutions were synthesized using the organic–inorganic steric entrapment method. The samples were characterized by in-situ high-temperature X-ray diffraction from 25 to 1500°C at the Advanced Photon Source and National Synchrotron Light Source II. The average linear thermal expansion of SrZr 4 P 6 O 24 and CaZr 4 P 6 O 24 was between −1 × 10 −6 per °C and 6 × 10 −6 per °C from 25 to 1500°C. The crystal structures of the high-temperature polymorphs of CaZr 4 P 6 O 24 and SrZr 4 P 6 O 24 with R 3 c symmetry were solved by Fourier difference mapping and Rietveld refinement. This polymorph is present above ∼1250°C. This work measured thermal expansion coefficients to 1500°C for all samples and investigated the differences in thermal expansion mechanisms between polymorphs and between compositions.

36 MATERIALS SCIENCE↗