BARIUM SILICATE Property

Melting point:

1604°C

Density 

1,67 g/cm³

refractive index 

1.67

solubility 

insoluble in H2O; soluble in acid solutions

form 

Powder

color 

White

Water Solubility 

Insoluble in water. Soluble in acids.

CAS DataBase Reference

13255-26-0(CAS DataBase Reference)

EPA Substance Registry System

Silicic acid (H2SiO3), barium salt (1:1) (13255-26-0)

Safety

Hazard Codes 

Xn

Risk Statements 

20/22

Safety Statements 

28

RIDADR 

UN1564

WGK Germany 

1

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

III

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Hazard statements

H302Harmful if swallowed

H332Harmful if inhaled

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

BARIUM SILICATE Chemical Properties,Usage,Production

Description

BaSiO3 is orthorhombic with unit-cell dimensions of a = 5.6182(5)?, b = 12.445(1), c = 4.5816 ?. It is dimorphic with α-BaSiO3 stable below about 990°C but forms β-BaSiO3 above 1000°C. A 1:1 mol ratio of BaO–SiO2 fired at 850°C and 1050°C serves to form the two dimorphs.
The enthalpy of solution of BaSiO3 in (3.15 mol/dm3 HF + 8.13 mol/dm³ HCl) has been measured. From the results, the standard molar enthalpy of formation of BaSiO3 (s) was calculated. The value obtained was -1606.4±2.6 kJ/mol.

Chemical Properties

Colorless powder. Insoluble in water; soluble in acids.

Uses

Barium silicate films that are suitable for use as transmission media in integrated optical circuits. It is shown that the films, which can be produced with a wide range of refractive indices by suitable selection of the ratio of the target constituents, exhibit low optical attenuation. Hence it is used for integrated optical circuits. It is used in ceramics.

Preparation

Bariumsilicate can be prepared by calcining the oxide with silica, SiO2, at an elevated temperature: BaO + SiO2 + hea?BaSiO3