Synthesis and characterization of (Sr1−x′K2x)Zr4(PO4)6 ceramics
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Single phase (Sr1−x′ K2x)Zr4(PO4)6, where x lies between 0.0 and 1.0, ceramic powder with a submicron scale particle size has been synthesized successfully at calcination temperatures as low as 650–750°C by a sol-gel technique. The formation of the powder strongly depends on calcination temperature, but is independent of solution pH in the studied range. Dilatometric measurement shows an ultra-low linear coefficient of thermal expansion of 0.1×10−6°C−1 when x=0.5 at temperature intervals of 25–1000°C. Thermal conductivity and flexural strength of the materials were determined at ambient temperature to be 1.0 Wm−1K−1 and as high as 280 MPa, respectively, indicating that this material can be an excellent candidate in many applications, especially those subjected directly to severe environments.
KeywordsParticle Size Thermal Conductivity Thermal Expansion Calcination Single Phase
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