Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermochemical properties of two mixed alkali-alkaline earth metal borates as non-linear optical materials: NaSrBO3 and KSr4B3O9

Wang, J.-F.[Jun-Feng], Wang, X.-L.[Xiao-Lan]
J. Chem. Thermodyn. 2014, 71, 200-204
ABSTRACT
Two mixed alkali-alkaline earth metal borates of NaSrBO3 and KSr4B3O9 have been synthesized by hightemperature solid state reaction, which were further characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of NaSrBO3(s) and KSr4B3O9(s) in 2.00 cm3 of 1 mol dm 3 HCl(aq), at T = 298.15 K were measured to be (206.84 +- 0.43) kJ mol 1 and (494.59 +- 0.53) kJ mol 1, respectively. The molar enthalpy of solution of NaCl(s) in 2.00 cm3 of {1 mol dm 3 HCl + H3BO3 + Sr(OH)2 8H2O}(aq) mixed solvent at T = 298.15 K was measured to be (5.17 +- 0.02) kJ mol 1. From these data and with the incorporation of the previously determined enthalpies of solution of H3BO3(s) in HCl(aq) of Sr(OH)2 8H2O(s) in (HCl + H3BO3)(aq), and of KCl(s) in {HCl + H3BO3 + Sr(OH)2 8H2O}(aq), together with the use of the molar enthalpies of formation for NaCl(s)/KCl(s), Sr(OH)2 8H2O(s), H3BO3(s), HCl(aq) and H2O(l), the standard molar enthalpies of formation of NaSrBO3(s) and KSr4B3O9 were calculated to be (1653.1 +- 1.4) kJ mol 1 and (5071.1 +- 3.4) kJ mol 1 on the basis of the designed thermochemical cycles, respectively.
Compounds
# Formula Name
1 Na sodium
2 Sr strontium
3 B boron
4 O2 oxygen
5 K potassium
6 BNaO3Sr sodium strontium borate (NaSrBO3)
7 B3KO9Sr4 potassium strontium borate (KSr4(BO3)3)
8 ClH hydrogen chloride
9 H2O water
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 8
  • 9
  • 6
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Mole fraction - 6; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Solvent: Amount concentration (molarity), mol/dm3 - 8; Liquid
  • Liquid
  • Calvet calorimetry
  • 1
  • POMD
  • 8
  • 9
  • 7
  • Molar enthalpy of solution, kJ/mol ; Liquid
  • Mole fraction - 7; Liquid
  • Pressure, kPa; Liquid
  • Temperature, K; Liquid
  • Solvent: Amount concentration (molarity), mol/dm3 - 8; Liquid
  • Liquid
  • Calvet calorimetry
  • 1
  • RXND
  • 1
  • 2
  • 3
  • 6
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1
  • RXND
  • 5
  • 2
  • 3
  • 7
  • 4
  • Molar enthalpy of reaction, kJ/mol
  • Solution calorimetry
  • 1