Ionic Conductivity and Sinterability of NASICON-Type Ceramics: The Systems NaM2(PO4)3+yNa2o (M = Ge, Ti, Hf, and Zr) |
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| Authors: | Hiromichi Aono Eisuke Suginoto |
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| Affiliation: | Department of Industrial Chemistry, Niidama National College of Technology, Yagumo-cho 7-1, niihama, 792, Japan |
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| Abstract: | Sodium-rich NASOCON-type ceramics, the NaM2(PO4)3+yNa2O (M = Ge, Ti, Hf, Zr) system, were investigated in order to obtain a material having a high Na+ conductivity and high density. The ionic conductivity and the sinterability were greately improved by an increase in the valve of y for all of the system examined. Added Na2O was not souble in teh NASICON-type skeletton, sice the lattice constants and teh X-ray diffraction patterns were not changed by the Na2O addintion in all of the samples. Na2O acts as a flux for obtaining highly dense ceramics and highly conductive grain boundaries. Partial A2 site insertion by Na+ ions is effective for the enhancement of conductivity, because the conductivity for Na1.5M(III)0.5Zr1.5(PO4)3 (M = In or Y) is about 1 order of magnitude higher than the maximum conductivity of the NaZr2(PO4)3+yNa2O system. |
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