Crystal Chemistry of Noncentrosymmetric Alkali-Metal Nb and Ta Oxide Pyroborates
β Scribed by Annapoorna Akella; Douglas A. Keszler
- Book ID
- 102604688
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 267 KB
- Volume
- 120
- Category
- Article
- ISSN
- 0022-4596
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π SIMILAR VOLUMES
Needle-shaped, moisture sensitive, yellow crystals of Na 3 TaS 4 were obtained by the reaction of Na 2 S 3 , Ta, and S at 450 Β°C. The structure was determined by single crystal X-ray diffraction and refined to R1 and wR2 values of 0.0172 and 0.0381, respectively. Na 3 TaS 4 crystallizes with 32 form
tantalum alkoxides, can be used as a precursor to grow tantalum oxide thin films by CVD for device application. Using this precursor, a Ta 2 O 5 film with a thickness of 180 nm had a leakage current density below 1 Β΄10 Β±8 A cm Β±2 for an electric field strength of 2 MV cm Β±1 , and a breakdown voltage