Thermodynamic assessment of B2O3–MgO binary system

Unlocking the effect of Li and Ce ions on the thermoluminescence and optically stimulated luminescence signals of the MgB4O7 compound

“…The DTA curve presents exothermic peaks at 650.71 °C and 784.90 °C that are possibly related to the reaction between B 2 O 3 and MgO and the crystallization of MgB 4 O 7 : MgO(s) + 2B 2 O 3 (l) → MgB 4 O 7 (s) ( T = 626 to 1026 °C, Δ H = −105.1 kJ mol −1 ). 34,35 In the temperature range from 185.20 °C to 1000 °C, the TGA curve shows a mass loss of 14.22% (61.03%–46.81%), which may be related to the water loss that occurs in the dehydration reaction of Mg(OH) 2 present on the surfaces of MgO particles. As MgO readily reacts with water when exposed to moisture, normally the surfaces of MgO particles are almost completely covered by magnesium hydroxide: MgO(s) + H 2 O(g) → Mg(OH) 2 (s).…”

“…form of triclinic Mg 2 B 2 O 5 (Suanite), as can be seen in the diffraction pattern of the ICSD card number 00-015-0537. 34,35 In the temperature range from 185.20 °C to 1000 °C, the TGA curve shows a mass loss of 14.22% (61.03%-46.81%), which may be related to the water loss that occurs in the dehydration reaction of Mg(OH) 2 present on the surfaces of MgO particles. As MgO readily reacts with water when exposed to moisture, normally the surfaces of MgO particles are almost completely covered by magnesium hydroxide: MgO (s) + H 2 O(g) → Mg(OH) 2 (s).…”

“…From 56.22 °C up to the temperature of 185.20 °C, the TGA curve shows a mass loss of 43.88% (46.81%-2.93%), value close to 43.67%, which is the theoretical value for the mass loss in the thermal decomposition of boric acid: 4H 3 BO 3 (s) → 2B 2 O 3 (s) + 6H 2 O(g) (T = 115 to 430 °C, ΔH = 84.64 kJ mol −1 ) 27,33. The DTA curve presents exothermic peaks at 650.71 °C and 784.90 °C that are possibly related to the reaction betweenB 2 O 3 and MgO and the crystallization of MgB 4 O 7 : MgO(s) + 2B 2 O 3 (l) → MgB 4 O 7 (s) (T = 626 to 1026 °C, ΔH = −105.1 kJ mol −1 ) 34,35. In the temperature range from 185.20 °C to 1000 °C, the TGA curve shows a mass loss of 14.22% (61.03%-46.81%), which may be related to the water loss that occurs in the dehydration reaction of Mg(OH) 2 present on the surfaces of MgO particles.…”

Ignition and Combustion Behavior of Sintered‐B/MgB2 Combined with KNO3

“…In contrast, s-B/MgB 2 does not experience such a process [17]. The existence of Mg and F can help form Mg/B/O, Mg/K/F or Mg/B/F compounds, which typically have a higher melting point [26,27]. Therefore, an alternate oxide layer is formed that allows subsequent oxidation.…”

Exfoliated Magnesium Diboride (MgB2) Nanosheets as Solid Fuels

“…According to the binary phase diagram of B 2 O 3 and MgO (Figure S3), the ternary systems of Mg, B, and O have three solid phases: MgB 4 O 7 , Mg 2 B 2 O 5 , and Mg 3 B 2 O 6 . 24 The formation of a ternary oxide phase in the oxidation process depends on the elemental composition of the bulk MgB 2 and MgB 2 nanosheets. For example, a B-rich part is prone to forming MgB 4 O 7 , and a Mg-rich part is prone to forming 2d).…”