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Process for making sno

A composition and particle technology, applied in the field of stannous oxide preparation, can solve problems such as miscalculation and soft errors

Inactive Publication Date: 2013-04-10
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this error will usually result in a round of miscalculations
Such soft errors are becoming a growing problem for integrated circuit chipmakers

Method used

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  • Process for making sno
  • Process for making sno

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 100 g of granular tin was charged into a 5 L glass reactor equipped with a mechanical stirrer, reflux condenser and active nitrogen purge. The reactor was charged with 345 mL of water and 460.5 mL of 37% hydrochloric acid. The solution was heated to an internal temperature of 110°C and held at this temperature for 12 hours, then cooled to an internal temperature of 35°C. The resulting solution was vacuum transferred to a 22 L reactor equipped with a mechanical stirrer and reflux condenser. The solution was carefully titrated at a rate of 300 mL / min with a previously prepared solution containing 600.3 g of sodium carbonate dissolved in 2.7 L of water. During the addition of the base, stir well to dissipate any foam that develops during the initial addition. After the foaming is complete, the rest of the alkali solution is added in one portion. The solution was heated to 105°C and allowed to reflux for 3 hours, then it was cooled back to an internal temperature of 35°C...

Embodiment 2

[0025] 25 g of granular tin was charged into a glass reactor equipped with a mechanical stirrer, reflux condenser and active nitrogen purge. The reactor was charged with 85 g of water and 115 mL of 37% hydrochloric acid. The mixture was heated to 50°C and reacted at this temperature for 72 hours until the solution became colorless and transparent, then cooled to ambient temperature. The solution was transferred to a glass reactor equipped with a mechanical stir bar and reflux condenser. To this solution was added 187 g of solid potassium carbonate, taking great care during the initial addition to minimize foaming at the top of the reaction. The resulting light gray slurry was heated to 100°C and stirred for 1 hour until the solution turned black in appearance. The solution was cooled to ambient temperature and then drained from the reactor and vacuum filtered to separate the desired blue / black solid from the colorless clear liquid. The resulting wet filter cake was put into...

Embodiment 3

[0027] 1 kg of tin foil with a low alpha-radiation source was loaded into a glass reactor equipped with a mechanical stirrer, reflux condenser and active nitrogen purge. The reactor was charged with 3.42 kg of water and 6.4 kg of 37% hydrochloric acid. The resulting solution was heated from 37°C to 105°C at a rate of 0.5°C / min and then kept at 105°C for 9 hours, then cooled to 25°C. To this colorless transparent solution was carefully added a solution containing 6 kg of sodium carbonate dissolved in 27 kg of water within 30 minutes. The resulting white slurry was heated at a rate of 0.3°C / min until the internal solution temperature reached 78°C and then the solution was cooled down at a rate of -0.2°C / min. Complete the entire heating / cooling procedure within 4 hours. The resulting black suspension was drained from the reactor and sent directly to a vacuum filter tank. The resulting wet cake was washed with 1 kg of water under constant vacuum filtration conditions without ag...

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Abstract

Methods of preparing stannous oxide including neutralizing a solution of divalent tin ions in a mineral acid using a weak base, followed by heating the neutralized solution optionally under an inert atmosphere are provided. The stannous oxide particles produced are readily soluble in alkyl sulfonic acids.

Description

technical field [0001] The invention relates to the field of metal oxides, in particular to the preparation of stannous oxide (SnO). Background technique [0002] Various metals, such as tin, are used in the production of electronic devices. For example, pure tin and tin alloys such as tin-lead, tin-bismuth, tin-silver and tin-silver-copper are used as solders to connect packages. These metals are often deposited on electronic device substrates by electroplating. Typically, tin electroplating baths contain divalent tin ions, optionally ions of alloy metals such as silver, copper, bismuth and mixtures thereof, an acidic electrolyte and optionally one or more various organic additives. A common source of divalent tin ions is stannous oxide (tin(II) oxide). Stannous oxide can be dissolved directly in the electroplating bath, or it can be dissolved separately in the acid and then added to the electroplating bath as a solution. [0003] Stannous oxide is generally prepared by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02
CPCC01G19/02C01G19/003
Inventor M·L·格朗布瓦斯
Owner DOW GLOBAL TECH LLC
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