Studies on synthesis, characterization and thermochemistry of Mg2[B2O4(OH)2]·H2O |
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| Authors: | L Zhihong H Mancheng G Shiyang |
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| Institution: | (1) School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an, 710062, P. R. China |
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| Abstract: | A new magnesium borate Mg2B2O4(OH)2]·H2O has been synthesized by the method of phase transformation of double salt at hydrothermal condition and characterized by XRD, IR, TG and DSC. The enthalpy of solution of Mg2B2O4(OH)2]·H2O in 0.9764 mol L–1 HCl was determined. With the incorporation of the enthalpies of solution of H3BO3 in HCl (aq), of MgO in (HCl+H3BO3) (aq), and the standard molar enthalpies of formation of MgO(s), H3BO3(s), and H2O(l), the standard molar enthalpy of formation of –(3185.78±1.91) kJ mol–1 of Mg2B2O4(OH)2]·H2O was obtained.This revised version was published online in November 2005 with corrections to the Cover Date. |
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| Keywords: | synthesis solution calorimetry standard molar enthalpy of formation Mg2[B2O4(OH)2]· H2O |
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