Other — Functionality in metal-organic framework minerals: Proton conductivity, stability and potential for polymorphism

2 measurement groups · 12 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

ST1 crystals · Single Crystal

5 mg hand-pressed pellet dissolved in 25 g of 5 molar aqueous HCl at 25 deg C; at least four measurements per sample.

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ST1 dissolution enthalpy in 5 molar HCl	91.38 +/- 0.66 kJ mol-1	—	+/- 0.66	SI Table Exact Reported	S3 · Thermodynamic cycle and data · Table S3
ST1 enthalpy of formation from oxides	-422.31 +/- 2.29 kJ mol-1	—	+/- 2.29	SI Table Exact Reported	S3 · Thermodynamic cycle and data · Table S3
ST2 dissolution enthalpy in 5 molar HCl	92.15 +/- 0.47 kJ mol-1	—	+/- 0.47	SI Table Exact Reported	S3 · Thermodynamic cycle and data · Table S3
ST2 enthalpy of formation from oxides	-423.08 +/- 2.24 kJ mol-1	—	+/- 2.24	SI Table Exact Reported	S3 · Thermodynamic cycle and data · Table S3
ZH dissolution enthalpy in 5 molar HCl	64.81 +/- 1.06 kJ mol-1	—	+/- 1.06	SI Table Exact Reported	S3 · Thermodynamic cycle and data · Table S3
ZH enthalpy of formation from oxidesMarked as a best value within this paper	-434.03 +/- 3.20 kJ mol-1	—	+/- 3.20	SI Table Exact Reported	S3 · Thermodynamic cycle and data · Table S3

ST2 crystals · Single Crystal

Mettler-Toledo TGA DSC 1 Star; N2 stream from 25 to 200 deg C at 5 deg C/min and air from 200 to 700 deg C at 10 deg C/min; sample size 2-10 mg.

Atmosphere: N2 then air; SI figures shown in N2 atmosphere
Geometry: Alumina crucibles
Context: hydrated, dehydrated and rehydrated stepanovite samples
Measurement source: 4925 · Thermogravimetric analysis and differential scanning calorimetry (TGA and DSC) analysis · SI Fig. S7-S11

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Rehydrated ST1d/ST1 TGA mass loss assigned to 9 H2O	-30.5068%	—	—	Visual Estimate Exact Reported	S8 · Selected thermal analysis data · Figure S11
ST1d TGA mass loss assigned to 6 H2O	-21.4645%	—	—	Visual Estimate Exact Reported	S8 · Selected thermal analysis data · Figure S10
ST2 TGA mass loss assigned to oxalate decomposition	-37.0690%	—	—	Visual Estimate Exact Reported	S7 · Selected thermal analysis data · Figure S7
ST2 TGA mass loss assigned to 9 H2O	-30.5785%	—	—	Visual Estimate Exact Reported	S7 · Selected thermal analysis data · Figure S7
Rehydrated ST2d TGA mass loss assigned to 9 H2O	-30.0622%	—	—	Visual Estimate Exact Reported	S8 · Selected thermal analysis data · Figure S9
ST2d TGA mass loss assigned to 6 H2O	-21.4080%	—	—	Visual Estimate Exact Reported	S7 · Selected thermal analysis data · Figure S8