Non-lead resistor composition
View Patent ↗A non-lead composition for use as a thick-film resistor paste in electronic applications. The composition comprises particles of Li 2 RuO 3 of diameter between 0.5 and 5 microns and a lead-free frit. The particles have had the lithium at or near primarily the surface of the particle at least partially exchanged for atoms of other metals.
1. A composition comprising particles of Li 2 RuO 3 in which Li atoms have been exchanged for Mg atoms.
2. A composition according to claim 1 in which at least 50 mol % of the Li atoms have been exchanged.
3. A composition according to claim 1 in which at least 75 mol % of the Li atoms have been exchanged.
4. A composition according to claim 1 wherein a Li 2 RuO 3 particle comprises first and second layers, and more Li atoms are exchanged in the first layer than in the second layer.
5. A composition according to claim 4 wherein less than 20% of the Li atoms in the second layer are exchanged.
6. A composition according to claim 4 wherein the first and second layers are adjacent.
7. A composition according to claim 4 wherein more than 80% of the Li atoms in the first layer are exchanged.
8. A composition according to claim 1 that is described by formula as follows: Mg y Li 2−2y RuO 3 where (2y)≦1.5.
9. A composition according to claim 8 further comprising one or both of an alkali metal, zinc alumino-borosilicate frit, and an alkaline-earth metal, zinc alumino-borosilicate frit.
10. A resistor comprising a composition according to claim 9 .
11. A resistor according to claim 10 that has a sheet resistance of about 100 kilohms per square to about 10 megohms per square, and/or a TCR of ±100 ppm/° C.
12. An electronic device comprising a resistor according to claim 10 .
13. A composition according to claim 1 further comprising one or both of an alkali metal, zinc alumino-borosilicate frit, and an alkaline-earth metal, zinc alumino-borosilicate frit.
14. A resistor comprising a composition according to claim 13 .
15. A resistor according to claim 14 that has a sheet resistance of about 100 kilohms per square to about 10 megohms per square, and/or a TCR of ±100 ppm/° C.
16. An electronic device comprising a resistor according to claim 14 .