JP3446649B2 - Method for producing oxide ion conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a perovskite type
Novel Oxide Ion Conduction of Structured Rare Earth Gallate System
bodyAbout the manufacturing method of. Of the present inventionManufactured by the methodOxide
The ionic conductor is a solid electrolyte or air electrode of a fuel cell,
Gas sensors such as oxygen gas sensors, electrochemical oxygen sensors
Pumps and oxygen separation membranes and gas separation membranes
is there. [0002] 2. Description of the Related Art Heretofore, representative examples of oxide ion conductors
Represents zirconium oxide (ZrO)_Two) With a small amount of CaO, M
gO, Y_TwoO_Three, Gd_TwoO_ThreeDivalent or trivalent metal oxidation such as
Zirconia with solid solution
Perovs exhibits higher oxide ion conductivity than zirconia
LaGaO with kite-type structure_ThreeA system electrolyte has been discovered. So
Among them, for example, part of La is Sr and part of Ga is
(La, Sr) (Ga, Mg, C) substituted with Mg and Co
o) O_ThreeAlready has a particularly high ionic conductivity
Reported (Summary of the 6th SOFC Research Presentation (20
4B), Summary of the 7th SOFC Research Presentation (209A),
FUELCELLSEMINERAbstracts
(1998) P104-, 442)
When producing, CoO powder is used as a raw material of Co.
Came. [0003] However, the conventional technique described above
Technology, using CoO powder as a raw material for Co
(Ln, Sr) (Ga, M)
g, Co) O_ThreeMeans high ion transport numbers (for electrical conductivity)
The ratio of the oxide ion conductivity of the
La_0.8Sr_0.2Ga_0.8Mg_0.15Co_0.05O_ThreeAnd
Also showed the highest value at 900 ° C.
The on-transport number decreases, and 0.9 in low temperature range (650 ° C or lower).
Lower. For example, oxide ion conductors are
When used as an electrolyte for aluminum, its electrical conductivity and ion transport
Rate is a critical point in determining battery performance.
The power generation performance of the battery is further improved, and the low temperature (600 to 800
℃), it is necessary to use a wide temperature range.
Electrolyte with high ion conductivity and low electron conductivity
Quality, that is, an oxide ion conductor with a high ion transport number
Strongly required. [0004] Means for Solving the Problems The present inventors have made the above demands.
In pursuing intensive research to answer the question, oxide ions
New material with very high conductivity and good solid electrolyte material
Fee La_0.8Sr_0.2Ga_0.8Mg_0.15Co_0.05O_ThreeMake
When performing Co, the raw material of Co_ThreeO_FourPowder or Co
O and Co_ThreeO_FourIncludes low temperature region by mixing with
While maintaining high electrical conductivity over a wide temperature range,
Has a higher ion transport number (ie, oxidation
Oxide ion with high ion conductivity and low electron conductivity)
The knowledge that a conductor can be obtained.
(See FIG. 1). [0005] The present invention is based on the findings obtained as described above.
Powder of the oxide of the component element
Precursor which is thermally decomposed into an oxide during powdering and / or firing
The powders of the substances are mixed at a predetermined mixing ratio and fired.
For producing an oxide ion conductor represented by the general formula (1)
In the law, Ln_1-xSr_xGa_{1- (y + z)}Mg_yCo_zO_Three In equation (1) Ln = one or two of La and Nd, x = 0.05-0.3 y = 0 to 0.29 z = 0.01-0.3 y + z = 0.025-0.3 Of the oxides of the component elements, cobalt oxide
_ThreeO_FourPowder or CoO and Co_ThreeO_FourUse mixed powder with
A method for producing an oxide ion conductor (1),
It is characterized by the following. [0006] In the present invention, "oxide ion conductor"
Is an electrically conductive material that exhibits substantial oxide ion conductivity
Means fee. That is, most of the electrical conductivity is oxide ion
Field conductivity rather than oxide ion conductor in a narrow sense
Depending on the case, mixed electron-oxide ion conductor (or oxide
Electronic conductivity called oxide mixed conductor) and oxide ion
Materials that have a large proportion of both conductivity are also considered in the present invention.
Is an oxide ion conductive material
Include in conductor. Most of the electrical conductivity is oxide ion conductivity
In the case of oxide ion conductor in the narrow sense occupied by
(Ratio of oxide ion conductivity to electrical conductivity)
Preferably 0.7 or more, more preferably 0.9 or more
It is. On the other hand, in the case of an electron-ion mixed conductor,
On-transport number is preferably 0.1-0.7, more preferably
0.2 to 0.6. [0008]Oxide ion conduction produced by the method of the present invention
The body isSolid oxide fuel cell electrolyte, cathode, gas
Sensors, oxygen separation membranes for electrochemical oxygen pumps, and
Separation Membrane Utilizing Gas Concentration DifferenceApplied to etc.. [0009] [Embodiment of the present invention]Hereinafter, manufactured by the method of the present invention.
Explain the oxide ion conductor. The above general formula
(1) of the present inventionObtained by manufacturing method
The oxide ion conductor has a perovskite-type crystal structure.
A, ABO_ThreeA site of perovskite type crystal shown by
Ln and Sr atoms of the above general formula occupy the B site
Is occupied by the remaining Ga, Mg, and Co atoms
I have. However, when Cu-Kα is used as the radiation source, the X-ray diffraction angle
A peak appears at about 30 ° and about 50 ° of 2θ Ln, Sr,
Oxides of one or more elements of Ga, Mg, Co, or
Or LnSrGa_ThreeO₇, Or partially LnSrGa
_(3-ab)Mg_aCo_bO₇(However, in Ln = La, Nd,
One or two, a ≠ 0 and / or b ≠ 0, and a = b <
It may have a two-phase structure including other phases shown in 3).
You. [0010] Originally, both A and B sites occupied by trivalent metal
Is partially converted to a divalent metal (for example, the above Sr occupying the A site).
Atom, Mg atom occupying B site) or transition metal Co
Occupies oxygen vacancies, which
More oxide ion conductivity results. Therefore, the number of oxygen atoms
Is reduced by the amount of the oxygen vacancies. That is, in the general formula (1), the number of oxygen atoms
Is displayed as if it were 3, but actually oxygen
The number of atoms is 3 or less. Oxygen vacancy in general formula (1)
Is at most 0.3, so the exact number of oxygen atoms is
The range is 2.7 to 3. However, the number of oxygen vacancies is
Temperature, oxygen, as well as the type of particles (Sr, Mg, Co)
Since it varies depending on the partial pressure, the type and amount of added atoms, etc.,
It is difficult to display accurately. Therefore, the present invention
In the chemical formula for a perovskite-type material, the oxygen atom ratio
The numerical value is displayed as 3 for convenience. In the general formula (1), Ln is a lantern
B is a non-transition metal. Immediately
In the present invention,Manufactured by the methodOxide ion conductor
Galvanic (LnGaO)_Three) With the basic structure
And an alkaline earth metal (Sr), a non-transition metal (M
g) and three types of atoms of a transition metal (Co).
This is a composite oxide. The present inventionIon conduction produced by the method of
bodyIn the above, the doping atom at each site, that is, A
Atomic ratio (x) of Sr atoms in the site and B site
Atomic ratio (y + z) of Mg atom + Co atom in
Beyond the stated range, the electrical conductivity of the composite oxide of the present invention
Decrease. The present inventionIon conduction produced by the method of
bodyIn the above, the oxide ion transfer represented by the general formula (1)
X-ray diffraction angle when Cu-Kα is used as the source in addition to the conductor
Ln at which peaks appear at about 30 ° and about 50 ° of 2θ,
Oxidation of one or more elements of Sr, Ga, Mg, Co
Material or oxide LnSrGa_ThreeO₇Or LnSrGa
_(3-ab)Mg_aCo_bO₇(However, in Ln = La, Nd,
One or two, a ≠ 0 and / or b ≠ 0, and a = b <
Oxide ion comprising a mixture containing the second phase represented by 3)
It may be a conductive material. In this case, too,
Is an oxide ion conductor represented by the general formula (1)
There is no difference from the characteristics of. By the way, in the general formula (1), B size
In the case of Co atoms, the z value, which is the atomic ratio of Co, increases.
The larger, the higher the electrical conductivity. This is because Co
Transfer metal, n-type or p-type
This atom increases because it is easy to develop the intrinsic electrical conductivity
The electronic conductivity increases and the electrical conductivity increases
That's why. Along with this, the oxide ion conductivity
(Ion transport number) decreases. Further, a composite oxide having az value of 0.15 or less is used.
If it is, the ion transport number becomes 0.7 or more, especially the z value
If it is 0.10 or less, the ion transport number is as high as 0.9 or more,
Function as an oxide ion conductor in the narrow sense described above
I know. However, in this case, the non-transition metal
Is not contained to some extent,
The contribution ratio of air conduction cannot be maintained below 0.3. This
Such materials are used in solid oxide fuel cells as described below.
Electrolyte, gas sensor, oxygen content for electrochemical oxygen pump
It is useful as a release film or the like. On the other hand, when the z value exceeds 0.15, the ion
When the transport number drops below 0.7, the electron-ion mixed conductor
Will function as As mentioned earlier, like this
Various materials are included in the oxide ion conductor in the present invention.
These function well as oxide ion conductors,
As mentioned, the conductivity is highest. Such a mixed biography
As described later, the conductor is air of a solid oxide fuel cell.
Useful for polar or gas separation membranes. The preferred composition in the above general formula (1) is
It is as follows. x = 0.10 to 0.25, especially 0.17 to 0.22, y
= 0 to 0.17, especially 0.09 to 0.13, y + z =
0.10 to 0.25, especially 0.15 to 0.20. The z value is determined by the high oxide ion conductivity (ion
(Transport number is 0.7 or more, preferably 0.9 or more)
When functioning as an oxide ion conductor in the sense of
y ≧ 0.025 and z = 0.02 to 0.15, especially
It is preferably 0.07 to 0.10. Meanwhile, electronic
-If one wants to function as a mixed ion conductor, z is
0.15 <z ≦ 0.3, preferably 0.15 <z
≦ 0.25. The oxide ion conductor of the present inventionManufacturing method
Is a powder of each oxide of the component element, Co is Co,
Co _Three O _Four Powder or CoO and Co_ThreeO_FourOf the mixed powder
The mixture that is well mixed at the mixing ratio is molded by appropriate means and fired.
SinteringHave features. As raw material powder
Is, besides oxides, before thermal decomposition into an oxide during firing
Inorganic substances (eg, carbonates, carboxylic acids, etc.) can also be used
You. The firing temperature for sintering is 1200 ° C. or higher, preferably
Is 1300 ° C. or more, and the firing time is several hours to several tens
Time. To reduce the firing time,
Pre-baking may be performed at a temperature lower than the formation temperature. This preliminary firing
Is applied at 500-1300 ° C. for about 1-10 hours, for example.
It can be performed by heating. Pre-fired mixture is required
If necessary, it is pulverized, molded and finally sintered.
Molding is uniaxial compression molding, hydrostatic pressing, extrusion molding,
Appropriate powder molding means such as tape cast molding can be adopted.
You. The firing atmosphere, including pre-sintering, is an oxidizing atmosphere such as air.
A gas or inert gas atmosphere is preferred. The present inventionManufactured by the methodOxide ion conduction
Of the body, y value is 0.025 or more and z value is 0.1
5 or less, oxide ion conduction in electrical conductivity
Sex is dominant (that is, ion transport number is 0.7 or more),
An oxide ion conductor in the narrow sense described above. This material is
Applications of various oxide ion conductors conventionally used
(For example, electrolytes of solid oxide fuel cells, gas sensors
-) Can be used. Of the present inventionManufactured by the methodThis kind of acid
The oxide ion conductor has high oxide ion conductivity and low temperature
However, since it can be operated, products with better performance
Expected to give. The application field of oxide ion conductor is wide
One of the important but important applications is the solid oxide type (solid
(Electrolyte type) An electrolyte of a fuel cell (SOFC). SO
The structure of the FC is not particularly limited, and may be a cylindrical type or a flat type.
[See Figures 3 (a) and 3 (b)]
And a monolithic type or a monolithic type. I
In the case of misalignment, the electrolyte layer is sandwiched between the air electrode and the fuel electrode.
Layer stack (electrolyte layer on one side is air electrode layer, other side is fuel layer
(Contacting the extreme layer) becomes the basic cell structure. Electrolyte layer is gas
Impervious, gas passes through the cathode and anode layers
It is porous so that it can be used. In the case of cylindrical type,
Fuel gas (eg, hydrogen) and air divided into internal and external
(Or oxygen) are supplied separately, and many cylindrical cells
Connected via an interconnector provided on a part of its outer surface
Is done. In the case of a flat plate type, supply fuel gas and air separately.
A generally flat interconnector with a supply channel
Gas is supplied by utilizing. Put this interconnect connector
Alternately stacked with the flat-plate cells of the three-layer structure described above
It is multilayered. The most developed SOFC at present
Is Y_TwoO_ThreeUsing stabilized zirconia (YSZ) thin film as electrolyte
The cathode has perovska, which has electronic conductivity.
Site type material (for example, Sr-containing LaMnO_Three), Anno
The metal may be a metal such as Ni or a thermometer such as Ni-YSZ.
Battery configuration using When the conductivity of YSZ is low
It is low and uses the heat of exhaust gas at around 1000 ℃
By cogeneration that operates the turbine generator
Since YSZ can be used as an electrolyte
SOFC is operated at high temperature around 1000 ° C
It is designed to be. SOFC has a voltage drop due to resistance loss of the electrolyte.
And the thinner the film, the higher the output. Therefore, electrolysis
Quality YSZ is used in thin films of about 30-50 μm
You. However, nonetheless, the oxide ion conductivity of YSZ
Is small, so that about 100
It needs to be heated to 0 ° C. Thin film YSZ with a thickness of 30 μm
The practical output density at an operating temperature of 1000 ° C. is
0.35W / cm^TwoReported to the extent. Than this
To increase the pond output or lower the operating temperature,
Uses a thin YSZ thin film of about 10 μm
Experimental examples have been reported.
Gas impermeability required for resolving becomes uncertain and reliability
Undesirable in terms of The present inventionManufactured by the methodPerovskite type
Oxide ion conductors in the narrow sense consisting of oxides are better than YSZ.
Have very high oxide ion conductivity.
Because it comes, for example, thickness 0.5mm (= 500μm)
SOFCs using thick-film electrolytes that can be sintered
To obtain higher output than the YSZ thin film
Can be. The maximum power density in this case is the atom of Co atom.
Although it depends on the ratio, a YSZ thin film with a thickness of 30 μm is also used.
Several times at operating temperature of 800 ° C (for example,
(For example, three times or more). Or 30μm thick
If used as a thin film, the temperature can be as low as 600 ° C to 700 ° C
YSZ film with the same thickness of 30μm is exhibited at 1000 ℃
Power density can be obtained. As described above, the present inventionManufactured by the method
The composite oxide has a lower oxide ion conductivity than YSZ.
Because it is always high, make the electrolyte thick, for example, about 0.5 mm
It is possible to manufacture from a sintered body
Strength and life are greatly improved, and YSZ is used as electrolyte.
A SOFC with a very high maximum power density
Can be Largest oxide ion conductor at present
Oxygen sensor, which is very useful for controlling the air twist ratio of automobiles.
Control of industrial processes such as steel making
Is also used. This oxygen sensor is a solid electrolyte acid
Oxygen concentration sensor is called as oxygen sensor.
It measures the degree. That is, whether it is an oxide ion conductor
If there is a difference in oxygen gas partial pressure at both ends of
Oxide ions diffuse into the part to form an oxygen concentration cell.
To measure the electromotive force by attaching electrodes to both ends.
The elementary partial pressure can be measured. Solid electrolyte oxygen cell
In addition to oxygen gas, the sensor_x, NO_xIncluding oxygen
It can also be used as a gas sensor. An oxygen sensor made of YSZ is relatively inexpensive.
Value, but lower oxide ion conductivity at lower temperatures
Therefore, it can be used as a sensor only at a high temperature of 600 ° C or higher.
Scratches and applications were limited. In contrast, oxide ion
Conductivity of the present inventionManufactured by the methodComposite oxide
The ion conductor (y ≧ 0.025, z ≦ 0.15)
Gas sensor because it always shows high oxide ion conductivity
-Particularly useful as an oxygen sensor-oxidizes even at low temperatures
High enough for ionic conductivity even at 600 ° C or lower
It becomes a usable gas sensor. The present invention in which oxide ion conductivity is dominant
ofManufactured by the methodComposite oxide ion conductor (y ≧ 0.0
25, z ≦ 0.15) is oxygen for electrochemical oxygen pump
It can also be used as a separation membrane. Oxide ion conductor
When a potential difference is applied to both ends of the separation membrane,
Current moves and current flows, causing oxygen to flow from one side to the other
It can flow in one direction to the surface. This is an oxygen pump
is there. For example, when air flows, oxygen is released from the opposite side
Used as oxygen separation membrane because enriched air can be obtained
Have been. Such an oxygen separation membrane is used, for example, in military service.
Use an airplane or helicopter to reduce oxygen
It is used to make chemical air. Medical oxygen cylinder
It is considered that it can be applied as a substitute. Also,
Mixed electron-ion conductivity (that is, ion transport number of 0.7 or less)
Lower) of the present inventionManufactured by the methodPerovskite acid
Oxide ion conductor (z> 0.15) attaches electrons to oxygen
It functions as an ionization catalyst and a current collector.
To transfer the necessary electron conductivity and oxide ions to the electrolyte
Enough to function as an oxide ion conductor for incorporation
Since it shows both high oxide ion conductivity,
Suitable for FC cathode material, at least the cathode
It is preferred that a part be composed of this material. According to the present invention, which exhibits mixed electron-ion conductivity,One
Manufactured by lawThe oxide ion conductor (z> 0.15)
It can also be used as a gas separation membrane utilizing a gas concentration difference.
In the case of gas separation membranes, an electric potential difference is applied to both sides of the membrane from outside.
It is not necessary to measure the difference in oxygen concentration in the gas on both sides of the separation membrane.
It becomes the driving force for separation. This difference in oxygen concentration causes oxide oxide
ON flows from the high concentration side to the low concentration side, and this flow is electrically
Electrons flow in the opposite direction to compensate for Therefore, oxidation
Some electronic conductivity along with ionic conductivity
(Ie, unless it is an electron-ion mixed conductor)
It will not work because it does not flow. This gas separation membrane can be used not only for oxygen but also for example.
For example, water or NO_xCan also be used to separate For water, minutes
When decomposed into oxide ions and water on the surface of the membrane,
The difference in the oxide ion concentration is created, and this is the driving force
Oxide ions flow and hydrogen remains without flowing,
Hydrogen can be produced from water. NO_xIn the case of
Decompose and NO_xDetoxified and separated into nitrogen and oxygen
You. In addition, the present inventionManufactured by the methodOxide b
On-conductors include electrochemical reactors and oxygen isotope separation membranes
Is also available. [0034] DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below.
I do. La_TwoO_Three, SrCO_Three, Ga_TwoO_Three, MgO, Co
O and Co_ThreeO_FourPrepare each raw material powder of metal oxide of
For o, Co: Co_ThreeO_FourIs 0:
100, 40:60, 70:30, 100: 0 mixed powder
As raw materials, and other raw material powders and La_0.8Sr_0.2Ga
_0.8Mg_0.15Co_0.05O_ThreeAre blended in proportions that produce
After mixing well, it was pre-baked at 1000 ° C. for 6 hours. This
Of the pre-fired mixed powder of
Only 0.5mm, 15mm diameter disk shape compression molding
Then, the compact was fired at 1500 ° C. for 3 hours and sintered.
The crystal structure of the obtained sintered body was examined by X-ray diffraction.
Both have a phase of perovskite crystal structure.
Was. However, when X-ray diffraction was performed using Cu-Kα as a radiation source,
Roller, CoO / Co_ThreeO_FourMolar ratio of Co; 0: 100
When the raw material is used, the diffraction angle 2θ is about 30 ° and
A compound showing a peak at about 50 ° was confirmed.
4). The electric conductivity of the obtained sintered body was determined by using a disc.
A rectangular parallelepiped sample cut from a sintered compact
After the paste is applied, a platinum wire is connected to connect 950 to 12
Bake at 00 ° C for 10 minutes, adjust to any oxygen partial pressure and temperature
In a tunable device, use the DC four-terminal method or the AC two-terminal method.
It was determined by measuring the resistance value. Adjustment of oxygen partial pressure
Is O_Two-N_TwoThis was performed using gas. Measurement of ion transport number
Is a sample obtained by baking electrodes on the obtained disc-shaped sintered body.
The oxygen partial pressure of the atmosphere at both ends of the
To produce an oxygen concentration battery and measure the electromotive force of this battery
And the theoretical electromotive force under the same conditions is calculated from the Nernst equation.
Therefore, the ratio of the measured value of the electromotive force to the theoretical electromotive force was obtained. The measurement results are shown in FIG. 1 and FIG. Figure 1
The ion transport number is shown in FIG.^-Fiveatm)
The electrical conductivity when the temperature is changed (conductivity array).
Nius plot). As shown in FIG._ThreeO_FourDepending on the formulation
The difference in electrical conductivity is small,
It turns out that it shows high conductivity. On the other hand, from FIG.
Powder Co_ThreeO_FourIf it is not contained, keep it at a low temperature of 650 ° C or less.
And the ion transport number drops sharply to a value of 0.9 or less.
On the other hand, raw material Co_ThreeO_FourThose with high ion transport
It can be seen that the ratio is maintained. Therefore, high even at low temperatures
It shows high ion transport number while maintaining conductivity.
Excellent electrical properties are now possible. [0037] According to the present invention, the conventional representative oxide
Oxide ions are more stable than stabilized zirconia
Perovskite-type composite oxide with high conductivity
Here, Co is used as a raw material for Co._ThreeO_FourPowder or CoO and C
o_ThreeO_FourUsing powder mixed with
The ratio between the electron conductivity and the electron conductivity,
Of course, while maintaining high electrical conductivity even at low temperatures,
High ion transport number. Therefore, the electric conductivity is high, and
Oxide ions in a narrow sense with ion transport numbers as high as 0.9 or more even at low temperatures
Not only materials useful as ON conductors, but also Co content
Therefore, the ion transport number can be controlled freely.
From this, a material useful as an electron-ion mixed conductor was also obtained.
It is. In particular, the present invention has a high ion transport number at low temperatures.
ClearManufactured by the methodOxide ion conductors have a wide temperature range.
It can be used in an environment
High oxide ion conductivity under all oxygen partial pressures,
Gas for solid oxide fuel cell electrolyte, oxygen sensor, etc.
Sensors and separation membranes for electrochemical oxygen pumps
Possibility of realizing useful and higher performance products
There is. In addition, the present invention showing electron-ion mixed conductivity
The oxide ion conductor is the air electrode of a solid oxide fuel cell.
And a gas separation membrane utilizing a gas concentration difference.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows Co as a raw material of Co according to the production method of the present invention.
La produced by changing the molar ratio of O: Co ₃ O ₄ to Co
₅ is a graph showing a change in ion transport number according to a temperature change of a perovskite-type ionic conductor composed of a composite oxide having a composition of _0.8 Sr _0.2 Ga _0.8 Mg _0.15 Co _0.05 O ₃ . FIG. 2 shows Co as a raw material of Ca according to the production method of the present invention.
La produced by changing the molar ratio of Co in O: Co ₃ O _4
4 is a graph showing a change in electric conductivity of a perovskite-type ionic conductor composed of a composite oxide having a composition of _0.8 Sr _0.2 Ga _0.8 Mg _0.15 Co _0.05 O ₃ according to a temperature change. FIG. 3 is a schematic diagram of a basic cell structure of an SOFC. FIG. 4 shows a raw material of Co according to the production method of the present invention.
L manufactured by changing the molar ratio of Co in Co: Co ₃ O ₄
X-ray diffraction of _{a 0.8 Sr 0.2 Ga 0.8 Mg 0.15} Co 0.05 O a complex oxide having ₃ having a composition ion conductor (Cu-
It is a graph which shows the peak of K (alpha)). [Description of References] 1: Base, 2: Air electrode layer, 3: Electrolyte layer, 4: Fuel electrode layer, 5: Interconnector

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI G01N 27/409 H01M 8/02 K H01M 8/02 G01N 27/58 A (72) Inventor Kiichi Komada Kitabukurocho, Omiya City, Saitama Prefecture 1-297 Mitsubishi Materials Corporation General Research Laboratory (56) References JP-A-10-255832 (JP, A) JP-A-10-114520 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ H01B 1/06-1 / 08,13 / 00 C01G 51/00

Claims (1)

(57) [Claims] [Claim 1] Powder and / or calcination of an oxide of a component element
Precursor powder that is thermally decomposed into oxide
Mixed at the compounding ratio of and sintering, represented by the following general formula (1)
In the manufacturing method of an oxide ion conductor, which _{is, Ln 1-x Sr x Ga} 1- (y + z) Mg y Co z O 3 Formula (1) Medium Ln = La, 1 kind selected from Nd or two of the oxides of x = 0.05~0.3 y = 0~0.29 z = 0.01~0.3 y + z = 0.025~0.3 component element, as an oxide of cobalt, Co
_{Use of 3} O ₄ powder or a mixed powder of CoO and Co ₃ O ₄
A method for producing an oxide ion conductor (1).