Ionic conductivity and sinterability of NASICON-type ceramics: The systems NaM{sub 2} (PO{sub 4}){sub 3} + yNa{sub 2}O (M = Ge, Ti, Hf, and Zr)

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

OSTI ID:413331

Aono, Hiromichi; Sugimoto, Eisuke ^[1]

---

1. Niihama National Coll. of Technology, Niihama, Ehime (Japan). Dept. of Industrial Chemistry

Sodium-rich NASICON-type ceramics, the NaM{sub 2}(PO{sub 4}){sub 3} + yNa{sub 2}O (M = Ge, Ti, Hf, Zr) systems, were investigated in order to obtain a material having a high Na{sup +} conductivity and high density. The ionic conductivity and the sinterability were greatly improved by an increase in the value of y for all of the systems examined. Added Na{sub 2}O was not soluble in the NASICON-type skeleton, since the lattice constants and the X-ray diffraction patterns were not changed by the Na{sub 2}O addition in all of the samples. Na{sub 2}O acts as a flux for obtaining highly dense ceramics and highly conductive grain boundaries. Partial A{sub 2} site insertion by Na{sup +} ions is effective for the enhancement of conductivity, because the conductivity for Na{sub 1.5}M(III){sub 0.5}Zr{sub 1.5}(PO{sub 4}){sub 3} (M = In or Y) is about 1 order of magnitude higher than the maximum conductivity of the NaZr{sub 2}(PO{sub 4}){sub 3} + yNa{sub 2}O system.

• OSTI ID: 413331
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
DENSITY
ELECTRIC BATTERIES
GERMANIUM PHOSPHATES
GRAIN BOUNDARIES
HAFNIUM PHOSPHATES
IONIC CONDUCTIVITY
PARTICLE SIZE
POWDERS
SINTERING
SODIUM OXIDES
SODIUM PHOSPHATES
SOLID ELECTROLYTES
SYNTHESIS
TITANIUM PHOSPHATES
X-RAY DIFFRACTION
ZIRCONIUM PHOSPHATES