Nitrate

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Nitrate salts

Author: Hans-Jürgen Schwarz
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The nitrate salts most frequently found in buildings and monuments are listed. The various salt phases are discussed in detail on separate pages, their occurrence and their deterioration potential is discussed and the weathering patterns are illustrated on separate pages.


Salt Formula Solubility at 20°C Deliqueszenz RH at 20°C Light refraction Birefringence Notes
Niter KNO3 3.108 mol/kg 93.7 % α = 1.335
β = 1.505
γ = 1.506
Δ = 0.171
Nitrocalcite Ca(NO3)2•4H2O 7.726 mol/kg 53.06% nx = 1.465
ny = 1.498
nz = 1.504
Δ = 0.039
Nitromagnesite Mg(NO3)2•6H2O 4.73 mol/kg 55.7% nx = 1.34
ny = 1.506
nz = 1.506
Δ = 0.166
Nitronatrite NaNO3 10.347 mol/kg 75.3% no = 1.587
ne = 1.336
Δ = 0.251
Calicum nitrate Ca(NO3)2
Calcium nitrate dihydrate Ca(NO3)2•2H2O
Calcium nitrate trihydrate Ca(NO3)2•3H2O
Nitrammite NH4NO3 1787 g/l 65% (20°C), 61.8% (25°C) nx = 1.411-1.416
ny = 1.605-1.623
nz = 1.630-1.649
Δ = 0.219-0.233