Research Article
Effect of Magnesium Borates on the Fire-Retarding Properties of Zinc Borates
Table 4
Crystallographic data of the synthesised magnesium and zinc borates.
| Mineral name | Admontite | Mcallisterite | Zinc oxide borate hydrate |
| Pdf number | 01-076-0540 | 01-070-1902 | 00-035-0433 | Chemical formula | MgO(B2O3)3·7(H2O) | Mg2(B6O7(OH)6)2·9(H2O) | Zn3B6O12·3.5(H2O) | Molecular weight (g/mole) | 375.27 | 768.56 | 596.04 | Crystal system | Monoclinic |
Rhombohedral | Monoclinic | Space group | P21/c (No. 14) | Pr3c (No. 167) | P21/n (No. 14) | a (Å) | 12.6610 | 11.5490 | 7.6950 | b (Å) | 10.0910 | 11.5490 | 9.8028 | c (Å) | 11.3220 | 35.5670 | 6.8378 | α (°) | 90.00 | 90.00 | 90.00 | β (°) | 109.60 | 90.00 | 107.03 | γ (°) | 90.00 | 120.00 | 90.00 | z | 4.00 | 6.00 | 2.00 | Density (calculated) (g·cm−3) | 1.83 | 1.86 | 2.93 | Characteristic peaks I (%)/2θ (°) | 100.0/7.404 56.9/16.848 38.6/12.064 | 100.0/10.139 35.7/15.332 32.9/31.875 | 100.0/23.743 96.0/21.770 96.0/25.847 |
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