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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