New Borate Precursors for Boron Nitride Powder Synthesis
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- 作者：G. Lynn Wood ; Jerzy F. Janik ; Mandana Z. Visi ; David M. Schubert ; and Robert T. Paine
- 刊名：Chemistry of Materials
- 出版年：2005
- 出版时间：April 5, 2005
- 年：2005
- 卷：17
- 期：7
- 页码：1855 - 1859
- 全文大小：376K
- 年卷期：v.17,no.7(April 5, 2005)
- ISSN：1520-5002
文摘
The thermal decomposition of guanidinium tetraborate, pentaborate, and nonaborate has beencharacterized under nitrogen and ammonia atmospheres, and conditions have been defined for bulk powderand aqueous aerosol transformations of these precursors to boron nitride (BN). The bulk pyrolyses underammonia (600-1400 
f">C) produce micrometer- and sub-micrometer-sized platelet morphology particleswith oxygen contents of 3-18 wt. %. Subsequent pyrolysis of these powders at 1600 f">C under NH3reduces the oxygen contents to <1 wt. %. Pyrolysis of aqueous aerosols containing the guanidiniumborates gives submicrometer spherical morphology BN particles. The chemistry and processing ofguanidinium borates are compared with the behavior of alternative precursors.
f">C) produce micrometer- and sub-micrometer-sized platelet morphology particleswith oxygen contents of 3-18 wt. %. Subsequent pyrolysis of these powders at 1600 f">C under NH3reduces the oxygen contents to <1 wt. %. Pyrolysis of aqueous aerosols containing the guanidiniumborates gives submicrometer spherical morphology BN particles. The chemistry and processing ofguanidinium borates are compared with the behavior of alternative precursors.