Hydrothermal Synthesis of Veatchite and Its Calcium Isomorph
Abstract
The hydrated strontium borate, veatchite (SrO.3B2O3.2H2O), and its calcium isomorph (CaO.3B2O3.2H2O) have been prepared by hydrothermal synthesis at 260 C. Veatchite was prepared by the reaction of Sr(OH)2 and H3BO3 solution and also by the conversion of tunellite (SrO.3B2O3.4H2O) in H3BO3 solution of 260 C. The calcium isomorph was prepared in a similar manner by the reaction of Ca(OH)2 and H3BO3 solution and also by the conversion of gowerite (CaO.3B2O3.5H2O) in H3BO3 solution at 260 C. The observed densities of the synthetic veatchite and the calcium isomorph, as determined with a pycnometer and using water as the liquid, were 2.77 + or - 0.04 and 2.31 + or - 0.02g/cc respectively, for 0.5-g samples of fine crystals. The highest and lowest indices of refraction (white light) for the synthetic veatchite and its calcium isomorph were deter mined to be 1.546 and 1.619 + or - 0.003, and 1.555 and 1.620 + or - 0.002, respectively.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1963
- Accession Number
- AD0409861
Entities
People
- C. R. Parkerson
Organizations
- Naval Ordnance Laboratory