, Volume 24, Issue 12, pp 4239-4245

Low thermal expansion and low thermal expansion anisotropy ceramic of Sr0.5 Zr2 (PO4 )3 system

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A low thermal expansion ceramic with a very low thermal expansion anisotropy was synthesized from the Sr0.5Zr2(PO4)3 system. The sintering was promoted by addition of MgO, and the solgel technique also improved the sinterability. The thermal expansion of the crystal was lowered by substituting Nb5+ for Zr4+ and 1/2Sr2+ pairs, becoming near-zero for Sr0.25Nb0.5Zr1.5(PO4)3. All dense ceramics in this system had a strength of about 80 MPa, and did not suffer microcracking even in the coarse-grained polycrystalline ceramics, owing to the very low thermal expansion anisotropy of the crystals.