Tags: High pressure experimental phase Magnesium dihydrogen silicate

Material Details

Final Magnetic Moment
0.001 μB

Calculated total magnetic moment for the unit cell within the magnetic ordering provided (see below). Typically accurate to the second digit.

Magnetic Ordering
Formation Energy / Atom
-2.400 eV

Calculated formation energy from the elements normalized to per atom in the unit cell.

Energy Above Hull / Atom
0.161 eV

The energy of decomposition of this material into the set of most stable materials at this chemical composition, in eV/atom. Stability is tested against all potential chemical combinations that result in the material's composition. For example, a Co2O3 structure would be tested for decomposition against other Co2O3 structures, against Co and O2 mixtures, and against CoO and O2 mixtures.

3.37 g/cm3

The calculated bulk crystalline density, typically underestimated due calculated cell volumes overestimated on average by 3% (+/- 6%)

Decomposes To
Mg45Si32(H29O69)2 + Mg3Si4(HO6)2 + H2O
Band Gap
4.923 eV

In general, band gaps computed with common exchange-correlation functionals such as the LDA and GGA are severely underestimated. Typically the disagreement is reported to be ~50% in the literature. Some internal testing by the Materials Project supports these statements; typically, we find that band gaps are underestimated by ~40%. We additionally find that several known insulators are predicted to be metallic.

Space Group

Hermann Mauguin
P2/m [10]
-P 2y
Point Group
Crystal System
We have not yet calculated a detailed bandstructure for this material

X-Ray Diffraction

    Select radiation source:
  • Cu
  • Ag
  • Mo
  • Fe

Calculated powder diffraction pattern; note that peak spacings may be affected due to inaccuracies in calculated cell volume, which is typically overestimated on average by 3% (+/- 6%)


A full elastic tensor has not been calculated for this material. Registered users can view statistical-learning-based predictions of this material's bulk and shear moduli.

Once you have registered you can also "vote" for full calculation of this material's elastic properties.

Similar Structures beta feature

Explanation of dissimilarity measure: Documentation.
material dissimilarity Ehull # of elements
EuMgF4 (mp-9539) 0.6341 0.059 3
InHO2 (mp-632711) 0.5611 0.013 3
SrMgF4 (mp-556290) 0.6442 0.056 3
SrMgF4 (mp-15316) 0.6264 0.057 3
AlHO2 (mp-1078520) 0.5070 0.044 3
NaAg(CN)2 (mp-568422) 0.6921 0.217 4
KAg(CN)2 (mp-582994) 0.7003 0.191 4
MgSi(HO2)2 (mp-1078877) 0.5071 0.152 4
Ba2UCuO6 (mp-550423) 0.6002 0.349 4
Ba2UCuO6 (mp-22272) 0.5853 0.349 4
NaN3 (mp-22003) 0.7275 0.000 2
NaN3 (mp-1066400) 0.6926 0.002 2
NaN3 (mp-1064952) 0.7225 0.002 2
LiN3 (mp-2659) 0.7473 0.000 2
Cs2KMn(CN)6 (mp-628216) 0.7111 0.118 5
Sr2LiCBr3N2 (mp-569782) 0.7093 0.000 5
LiEu2CBr3N2 (mp-568863) 0.7025 0.000 5
Cs2KFe(CN)6 (mp-505660) 0.7133 0.093 5
Cs2KCo(CN)6 (mp-505662) 0.7119 0.021 5
AgSbH2C2(NF3)2 (mp-690698) 0.6947 0.160 6
Up to 5 similar elemental, binary, ternary, quaternary, etc. structures displayed (dissimilarity threshold 0.75). Ehull: energy above hull per atom [eV].

Calculation Summary

Structure Optimization

Run Type
Energy Cutoff
520 eV
# of K-points
U Values
VASP PAW: Mg_pv Si H O
Final Energy/Atom
-6.2104 eV
Corrected Energy
-52.4309 eV
Uncorrected energy = -49.6829 eV Composition-based energy adjustment (-0.687 eV/atom x 4.0 atoms) = -2.7480 eV Corrected energy = -52.4309 eV

Detailed input parameters and outputs for all calculations

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  • 190935
  • 190936
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  • Magnesium dihydrogen silicate

Displaying lattice parameters for primitive cell; note that calculated cell volumes are typically overestimated on average by 3% (+/- 6%). Note the primitive cell may appear less symmetric than the conventional cell representation (see "Structure Type" selector below the 3d structure)