K2Mg2Si2O7
K2Mg2Si2O7 is a metastable, wide-gap insulating silicate compound composed of potassium, magnesium, silicon, and oxygen.
About K2Mg2Si2O7
K2Mg2Si2O7 is a complex silicate compound composed of potassium, magnesium, silicon, and oxygen. As a wide-gap insulator, it exhibits electronic properties characteristic of stable dielectric materials, though it exists in a metastable state within the broader landscape of inorganic silicates. Its structural diversity is highlighted by multiple reported configurations across various databases, reflecting interest in its unique coordination environment. The compound serves as an intriguing subject for fundamental research into complex oxide stability and structural phase transitions. Given its insulating nature, it is primarily studied for its potential role in advanced ceramic development and as a host material for specialized applications where electronic isolation is required. Its metastable nature suggests that synthesis conditions are critical for stabilizing specific structural forms for practical use.
Key Properties
Cross-validated computational properties for K2Mg2Si2O7, aggregated across 3 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for K2Mg2Si2O7, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| P-31m (No. 162) | trigonal | 4.96 | 0.0349 | -6.853 | 3.20 |
| P-31m (No. 162) | — | — | — | — | — |
| P-31m (No. 162) | Trigonal | — | — | — | 3.20 |
| P-31m (No. 162) | Trigonal | — | — | — | 3.38 |
| P-31m (No. 162) | Trigonal | — | — | — | 3.29 |
Applications
Where K2Mg2Si2O7 is used.
Frequently Asked Questions
Common questions about K2Mg2Si2O7, answered from cross-validated data.
What is K2Mg2Si2O7?
K2Mg2Si2O7 is a metastable, wide-gap insulating silicate compound composed of potassium, magnesium, silicon, and oxygen.
What is K2Mg2Si2O7 used for?
What is the band gap of K2Mg2Si2O7?
Is K2Mg2Si2O7 a metal, semiconductor, or insulator?
Is K2Mg2Si2O7 thermodynamically stable?
What is the crystal structure of K2Mg2Si2O7?
What is the density of K2Mg2Si2O7?
How many polymorphs of K2Mg2Si2O7 are known?
What elements does K2Mg2Si2O7 contain?
Where does the data for K2Mg2Si2O7 come from?
How It Compares
As a unique silicate, K2Mg2Si2O7 represents a specific structural arrangement within the vast family of potassium-magnesium silicates. Unlike more common, highly stable mineral phases, this compound occupies a distinct metastable niche, offering researchers a platform to explore structural variations that are not accessible in thermodynamically favored materials.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
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