Constituent Gd2Si2O7 | SSHADE

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Constituent

Name: Gd2Si2O7
Official name: Gadolinium pyrosilicate

Family: ionic solid
Class: alkali salt
Compound type: silicate
Comments: the others polymorphes are a tetragonal phase $\beta-Gd_2Si_2O_7$ , monoclinic and trigonal phases

Constituent abundance in material

Relevance: main - major
Arrangement: single phase
Mass fraction: 1.0
Mole fraction: 1.0

Chemical composition

Formula: $Gd_2Si_2O_7$
Chemical formula: Gd2Si2O7
Elemental formula: (Gd3+)2 Si2 O (O-)6
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Gd^{3+}$	Gadolinium cation	element	2	0.6666666666666666	1	constituent cation	main
	$(Si_2O_7)^{6-}$	Sorosilicate anion	chemical function	1	0.3333333333333333	1	anionic radical	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(Si_2O_7)^{6-}$	1

Chemical bonds

	Bond	Number
	$\cdot (\cdot) Gd^{3+} \cdot O^{-}-$	6
	$\geq Si-O-$	2
	$\geq Si-O^-$	6

Class: normal salts (07)
Type: simple normal salts (07.01)

Phase name: $\alpha-Gd_2Si_2O_7$
Phase type: crystalline

Crystallography

Crystal system: orthorhombic
Crystal class: dipyramidal
Crystal class symbol: mmm (D2h)
Crystal spacegroup: Pnma

Texture: polycrystalline

Physical properties

Molar mass: 482.66 $g/mol$
Density: 5.5 $g/cm^3$

Optical properties

Refringence type: biaxial
Color: colorless, white
Diaphaneity: transparent to translucent