Claims
- 1. A method for producing electrically charged tin-IV-oxide having a divalent tin content of, at the most, 2% by weight and having a halide content of between about 0.1 to 2.5% by weight, said divalent tin and said halide being present in the tin-IV-oxide individually or in mixture, said method of comprising:
- mixing by grinding tin-II-oxide with tin-II-fluoride or hydrofluoric acid, wherein said tin-II-fluoride or hydrofluoric acid is present in an amount up to 20% by weight of the mixture;
- thereafter annealing the mixture thus obtained at a temperature range of about between 200.degree. to 700.degree. C.; and
- grinding the annealed product to obtain said tin-IV-oxide in a predetermined particle size.
- 2. The method as claimed in claim 1, wherein a lower molecular alcohol is added to the mixture of tin-II-oxide and tin-II-fluoride or hydrofluoric acid.
- 3. The method as claimed in claim 2, wherein said alcohol is methanol or ethynol.
- 4. A method for producing electrically conductive tin-IV-oxide having a divalent tin content of, at the most, 2% by weight and having a halide content of between about 0.1 to 2.5% by weight, said divalent tin and said halide being present in the tin-IV-oxide individually or in mixture, said method comprising:
- precipitating basic tin-II compounds, basic tin-II-hydroxides or mixtures thereof from tin-II salt solutions;
- washing the precipitated products thus obtained;
- stirring the washed precipitation products with 5 to 10% by weight, calculated on the precipitated basic tin-II compounds, of tin-II-fluoride in the form of an aqueous solution, said stirring being performed during a period of about between 5 to 60 minutes, whereby doped precipitation products are obtained;
- separating the doped precipitation products from the solution;
- washing them;
- drying the doped precipitation products at temperatures of between about 100.degree. to 200.degree. C.;
- annealing the doped products at temperatures of about between 200.degree. to 700.degree. C.; and
- thereafter grinding the annealed product into small particles of predetermined size.
- 5. A method for producing electrically conductive tin-IV-oxide having a divalent tin content of, at the most, 2% by weight and having a halide content of between about 0.1 to 2.5% by weight, said divalent tin and said halide being present in the tin-IV-oxide individually or in mixture, said method comprising:
- precipitating basic tin-II compounds, basic tin-II-hydroxides or mixtures thereof from tin-II salt solutions;
- conducting the precipitation in the presence of 1 to 70% by weight, calculated on precipitated basic tin-II compounds, of tin-II-fluoride, whereby doped precipitation products are obtained;
- separating the doped precipitation products from the solution;
- washing the doped precipitation products;
- drying the doped precipitation products at temperatures of about between 100.degree. to 200.degree. C.;
- thereafter annealing the products at temperatures of about between 200.degree. to 700.degree. C.; and
- grinding the annealed product into particles of predetermined size.
- 6. A method for producing electrically conductive tin-IV-oxide having a divalent tin content of, at the most, 2% by weight and having a halide content of between about 0.1 to 2.5% by weight, said divalent tin and said halide being present in the tin-IV-oxide individually or in mixture, said method comprising:
- introducing 10 to 100% by weight, calculated on tin-II-halide, of alkylene oxide into an aqueous tin-II-halide solution, whereby a precipitation product is obtained;
- separating the precipitation product from the solution;
- drying the precipitation product at temperatures of about between 100.degree. to 200.degree. C.;
- annealing the product thereafter at temperatures of about between 200.degree. to 700.degree. C.; and
- grinding the annealed product into particles of predetermined size.
- 7. The method as claimed in claim 6, wherein ethylene oxide is the alkylene oxide.
- 8. A method for producing electrically conductive tin-IV-oxide having a divalent tin content of, at the most, 2% by weight and having a halide content of between about 0.1 to 2.5% by weight, said divalent tin and said halide being present in the tin-IV-oxide individually or in mixture, said method comprising:
- mixing by grinding tin-IV-oxide with, calculated on the mixture, up to 20% by weight of tin-II-fluoride;
- annealing the mixture thus obtained in a temperature range of about between 200.degree. to 700.degree. C.; and
- grinding the annealed product into particles of predetermined size.
- 9. A method for producing electrically conductive tin-IV-oxide having a divalent tin content of, at the most, 2% by weight and having a halide content of between about 0.1 to 2.5% by weight, said divalent tin and said halide being present in the tin-IV-oxide individually or in mixture, said method comprising:
- mixing by grinding a mixture of tin-II-oxide and tin-IV-oxide with, calculated on the mixture, up to 20% by weight of tin-II-halide;
- annealing the mixture thus obtained in a temperature range of about between 200.degree. to 700.degree. C.; and
- grinding the annealed product into particles of predetermined size.
- 10. A method as claimed in claims 1, 4, 5, 6, 8 or 9, wherein the mixture is annealed in a temperature range of about between 300.degree. to 600.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4006044 |
Feb 1990 |
DEX |
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Parent Case Info
This is a division of application Ser. No. 07/651,579 filed Feb. 6, 1991 now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0065724 |
Apr 1985 |
JPX |
0260424 |
Dec 1985 |
JPX |
2080275 |
Feb 1982 |
GBX |
2156386 |
Oct 1985 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
651579 |
Feb 1991 |
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