Barium Oxide

Barium oxide, also known as anhydrous barium oxide or heavy earth, is an inorganic compound and an oxide of barium.

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1. Basic Information

Definition: Barium oxide, also known as anhydrous barium oxide or heavy earth, is an inorganic compound and an oxide of barium. It is toxic, highly hygroscopic and carbon dioxide - absorbent in the air, reacting with water to form barium hydroxide.

Chemical Formula: BaO

Molecular Weight: 153.33

CAS NO.: 1304 - 28 - 5

Common Specifications: The common specifications of barium oxide are classified by purity, covering multiple grades. The reagent grade includes analytical pure specification with purity ≥ 97.0%; the industrial grade has a wide purity range from 50% to 99%, among which the purities of 97% and 99% are widely used in industrial fields such as ceramics and glass.

Industrial Grade Food Grade

SPECIFICATION	STANDARD	RESULT
Barium Oxide	96% MIN	97.60%
Chloride (as Cl)	0.01% MAX	0.006%
Water Insoluble Matter	0.5% MAX	0.3%
Fe	0.005% MAX	0.003%
Pb	0.005%	0.003%

Storage Conditions

It should be sealed and stored in a dry, cool and well - ventilated warehouse, with moisture - proof measures as the key priority. During storage, it is strictly prohibited to store and transport together with acids. Meanwhile, the damage of product packaging should be avoided, and rain and sun exposure should be prevented during transportation.

2. Physical Properties

Under normal conditions, barium oxide is mostly a white to yellowish - gray powder, and its crystalline form is colorless cubic crystals. Its density is 5.72g/mL (at 25℃), with a melting point of about 1918℃ and a boiling point of approximately 2000℃. It has special solubility: it is soluble in acids and molten liquids of alkali metal chlorides or sulfates, but insoluble in acetone and ammonia water. It is only slightly soluble in water, and the dissolution process is accompanied by relevant reactions. In addition, its refractive index is 1.98, and it has good high - temperature stability, maintaining its own characteristics and not being easy to change in high - temperature environments.

3. Main Uses

● Glass Manufacturing

Adding it to glass can improve the refractive index, density, glossiness and chemical stability of glass. It is often used in high - grade tableware glass, optical glass, radiation - proof glass, etc. Adding a small amount of barium oxide to bottle glass can also play a role in fluxing and clarification.

● Ceramic Field

As a secondary flux, it can produce unique matte glaze surfaces and bright colors, enhance the stability of glazes, and is also the main raw material for synthesizing barium titanate frits. It can improve the performance of ceramic materials and reduce the sintering temperature in electronic ceramics, zirconate ceramics, etc.

● Electronic Devices

Due to its good electron emission performance and low volatility that will not pollute the target surface, it can be used as a related material for the cathode structure of low - power X - ray tubes.

● Drying Field

As a non - regenerative alkaline desiccant, it is suitable for drying neutral or alkaline gases, amines and alcohols in laboratories, and it can still be used as a desiccant in a red - hot state.

● Other Aspects

It is the core raw material for manufacturing barium salts such as barium peroxide; in beet sugar refining, it can undergo a substitution reaction with the hydrogen of hydroxyl groups in sucrose molecules to form addition compounds, helping to extract sucrose from molasses.

4. Packaging Specifications

The packaging specifications vary according to different application scenarios. The reagent - grade packaging is relatively small, including brown glass bottle packaging of 25g, 100g and 500g; the industrial - grade packaging is mainly large - sized, with common specifications of 25kg/bag, 50kg/bag and 200kg/bag. Some are packaged in plastic drums, and there is also a 20kg/case packaging form to meet specific industrial needs.

5. Core Advantages

● Strong Functional Adaptability

In the fields of glass and ceramics, it can not only play a fluxing role but also optimize product performance, such as improving the special properties of glass and endowing ceramics with various glaze colors; in the drying field, the use characteristic in a red - hot state is not possessed by most desiccants, which can meet the drying needs of special scenarios.

● Controllable Reaction Activity

It can undergo specific reactions with various substances, and the reaction effect is stable. For example, it can ensure the purity of products when preparing barium salts, and can accurately realize the separation and extraction of sucrose in beet sugar refining, providing reliable support for related processes.

● Significant Material Modification Effect

Adding a small amount can significantly improve the key properties of materials. For example, a small amount of barium oxide can accelerate glass melting, and low - dose use in ceramics can reduce the sintering temperature, helping to reduce production energy consumption while ensuring product quality.

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