Synthesis and electric conductivity of a NASICON-type electrolyte

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6293352

Bukun, N G; Domashnev, I A; Moskvina, E I; Ukshe, E A

The purpose of this work was to study the sequence of solid-phase reactions in the synthesis of the solid electrolyte, corresponding to the stoichiometric composition Na/sub 3/Zr/sub 2/Si/sub 2/PO/sub 12/. The solid-phase reaction of the mixture ZrO(NO/sub 3/)/sub 2/ x 2H/sub 2/O, Na/sub 2/CO/sub 3/, NH/sub 4/H/sub 2/PO/sub 4/ and amorphous SiO/sub 2/ proceeds through the stage of dehydration of zirconium oxide-nitrate, decomposition of ammonium dihydrophosphate, and formation and decomposition of ammonium and sodium nitrates. The intermediate products of the reaction are sodium and zirconium phosphates, and part of the ZrO/sub 2/ participates in the reaction in the form of an amorphous or metastable tetragonal modification, while part transforms into a stable monoclinic modification. The formation of NASICON starts near 1000/sup 0/C, and in addition silicon dioxide, which can first transform from the amorphous state into the mixture of tridymite and ..cap alpha..-cristobalite, participates in the reaction only at this stage. After annealing at 1230/sup 0/C the single-phase solid electrolyte Na/sub 3/Zr/sub 2/Si/sub 2/PO/sub 12/, having a conductivity of 0.14 S/cm at 300/sup 0/C and 0.00028 S/cm at 25/sup 0/C, is obtained.

• OSTI ID: 6293352
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 24:3; ISSN INOMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
AMMONIUM PHOSPHATES
ANNEALING
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
COHERENT SCATTERING
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROLYTES
HEAT TREATMENTS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OXYNITRATES
PHASE STUDIES
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHOSPHORUS OXIDES
PHYSICAL PROPERTIES
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SODIUM CARBONATES
SODIUM COMPOUNDS
SODIUM OXIDES
SOLID ELECTROLYTES
SYNTHESIS
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES