Environmentally benign bismuth-containing spin-on precursor materials
US6303804A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Sep 13, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G7/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Metal acid salt complexes are provided comprising (1) a first metal ion consisting essentially of bismuth, and optionally, at least one second metal ion selected from the group consisting of barium, calcium, strontium, lead, titanium, tantalum, and niobium, and (2) a polyether acid. The metal acid salt complexes are prepared by combining (1) bismuth ion, and optionally, at least one second metal ion and (2) at least one of a polyether acid and a polyether acid anhydride prepared from the polyether acid. In particular, the use of a mixture of bismuth, strontium, and niobium and/or tantalum salts of the hydrophilic acid 3,6-dioxaheptanoic acid salt is described for production of ceramic thin films, such as for use in ferroelectric devices, using non-toxic solvents. As a consequence, improved electronic devices are formed from less toxic and easier handled precursors and solvents. The present invention provides soluble spin-on precursors which are compatible and soluble in non-toxic and environmentally benign solvents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.