WHAT IS CLAIMED IS:
1 . An electron emissive composition comprising:
a barium tantalate composition of the formula (I)
(Bal,, Cax, Sr,, Dq)6(Taly, Wy, Et, Fu, GV,C aW)zO(I l* s) (1)
,
wherein 6 is an amount of about 0 to about 6; and wherein D is either an alkali earth
metal ion or an alkaline earth metal ion; E, F, and G are alkali earth metal ions,
alkaline earth metal ions andlor transition metal ions; x is an amount of up to about
0.7; y is an amount of up to about 1 ; p and q are amounts of up to about 0.3; and t is
an amount of about 0.05 to about 0.10; u is an amount of up to about 0.5; v is an
amount of up to about 0.5 and w is an amount of up to about 0.25.
2. The composition of Claim 1, wherein D is magnesium, E is zirconium,
F is niobium, and G is titanium.
3. The composition of Claim 1, wherein x is in an amount of about 0.25
to about 0.35, y is about 1 and p, q, t, u, v and w are each equal to 0.
4. The composition of Claim 1, wherein x is in an amount of about 0.25
to about 0.35, and y, p, q, t, u, v and w are each equal to 0.
5. An electrode manufactured by the composition of Claim 1.
A
6. The composition of Claim 1, wherein the composition further
comprises a nitrocellulose binder.
7. The composition of Claim 1, wherein the composition further - comprises a solvent comprising propylene glycol mono-methyl ether acetate having
about 1 to about 2 wt% denatured alcohol based on the total weight of the propylene
glycol mono-methyl ether acetate and denatured alcohol.
8. A method for manufacturing an electron emissive composition
comprising:
blending metal compounds in a stoichiometry effective to obtain at a barium
tantalate composition of the formula (I)
where 6 is an amount of about 0 to about 6; and wherein D is either an alkali earth
metal or an alkaline earth metal ion; E, F, and G are alkali earth metal ion, alkaline
earth metal ion and/or transition metal ion; x is an amount of up to about 0.7; y is an
amount of up to about 1 ; p and q are amounts of up to about 0.3; and t is an amount of
about 0.05 to about 0.1 0; u is an amount of up to about 0.5; v is an amount of up to
about 0.5 and w is an amount of up to about 0.25.
9. The method of Claim 8, wherein the metal compounds are oxides,
peroxides, carbonates, nitrates, carboxylates sulfates, or chlorides of alkali earth
metals, alkaline earth metals or transition metals.
10. The method of Claim 8, wherein D is magnesium, E is zirconium, F is
niobium, and G is titanium.
11. The method of Claim 8, wherein the blending fbrther comprises
mechanically milling the metal compounds to a particle size of about 0.4 to about 8
micrometers.
12. The method of Claim 8, wherein the blending fbrther comprises adding
a binder and a solvent to the metal compounds.
13. The method of Claim 8, further comprising sintering the metal
compounds to a temperature of about 1000°C to about 1700°C.
14. A method for manufacturing an electron emissive composition
comprising:
blending a barium tantalate composition of the formula (I)
wherein 6 is an amount of about 0 to about 6; and wherein D is either an alkali earth
metal ion or an alkaline earth metal ion; E, F, and G are alkali earth metal ion,
alkaline earth metal ion andlor transition metal ion; x is an amount of up to about 0.7;
y is an amount of up to about I; p and q are amounts of up to about 0.3; and t is an
amount of about 0.05 to about 0.10; u is an amount of up to about 0.5; v is an amount
of up to about 0.5 and w is an amount of up to about 0.25, with a binder; and
sintering the barium tantalate composition with the binder at a temperature of
about 1000°C to about 1700°C.