Low density amorphous water ice | SSHADE

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Solid phase

Official name: Low density amorphous water ice

Name and identifiers

Secondary names: amorphous ice; LDA ice

Family: molecular solid
Class: hydrogen bonded molecular solid
Compound type: inorganic molecular solid

Chemical composition

Formula: $H_2O$
Chemical formula: H2O
Elemental formula: H2 O
Isotope mixture type: terrestrial abundance

2.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$H_2O$	Water	molecule	1	1.0	1.0	pure	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$R-OH$	2

Chemical bonds

	Bond	Number
	$-O \dots H-$	4
	$-O-H$	2

Class: molecular solids with hydrogen bonded molecules (03)
Type: homomolecular H-bonded solids (03.01)
Group: H2O polymorphs (03.01.01)

Associated phases

Equivalent liquid: Liquid water

Crystallography

Phase name: LDA water ice
Phase type: amorphous
Crystal system: amorphous
Crystal class: N/A
Comments: no non-hydrogen-bonded water molecules, except dangling bonds

Physical properties

Molar mass: 18.0153 $g/mol$
Density: 0.94 $g/cm^3$

Thermodynamical properties

State NTP

liquid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-solid	H2O VIII	from ice VIII only: 130K (1 bar)
solid-solid	HDA ice	from HDA: 120K (1 bar), to HDA: 77K (0.5 GPa)
solid-solid	VHDA	from VHDA only: 77-127K (0.11 GPa)

Phase transitions comments

LDA ice is metastable and can form by warming of high density amorphous ice and high pressure ices VHDA and ice VIII

Optical properties

Refringence type: isotropic
Refringence sign: no
Birefringence: 0
Pure color: colorless
Color: colorless
Diaphaneity: transparent
Luster: vitreous

Links and Publications

Links