Thermal Expansion Behavior of NaZr2(PO4)3Type Compounds |
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Authors: | TOSHITAKA OOTA IWAO YAMAI |
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Affiliation: | Ceramic Engineering Research Laboratory, Nagoya Institute of Technology, 10–6 Asahigaoka, Tajimi 507, Japan |
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Abstract: | The thermal expansion of the skeletal framework was essentially zero for NaZr2(PO4)3-type compounds; the interstitialion, e.g., Na+, was primarily responsible for the total thermal expansion. The composition dependence of the thermal expansion is discussed in terms of the amounts, crystallographic sites, and ionic radii of the interstitial ions. The mechanism which results in low thermal expansion was clarified, particularly for KZr2(PO4)3, in which a larger ion is substituted for Na+, and NbZr(PO4)3, which does not contain Na+. Polycrystalline ceramics formed from these crystals might be useful as thermal-shock-resistant materials. |
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