Structural transformations of boron trioxide under high pressure and high temperature. Issue 11 (1st August 2018)

• Record Type: Journal Article
• Authors: Chu, Dongliang; Ma, Hongan; Wang, Jian; Chen, Lixue; Jia, Xiaopeng
• Is Part Of: Ceramics international. Volume 44:Issue 11(2018)
• Page Start: 12491
• Page End: 12495
• Publication Date: 2018-08-01
• Subjects: B2O3 -- Phase diagram -- HPHT -- Hardness -- Raman spectrum -- Boroxol rings; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.04.041
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A systematic study of boron trioxide under high pressure and high temperature (HPHT) was conducted using a Chinese multi-anvil high-pressure apparatus (CHPA). The HPHT phase diagram was determined using X-ray diffraction measurements. Under high pressure (3.6–5.5 GPa) and low temperature (below 450 °C), the boron trioxide grains were reduced to the nanometer size and the hardness reaches to 13.9 GPa (5.5 GPa and 450 °C). The boroxol rings were produced only in the glass phase that was transformed from the α-B2 O3 phase under HPHT. And the formation mechanism of boroxol rings was discussed according to Raman spectrum and crystal structure of α-B2 O3 and β-B2 O3 .