Lanthanum Nitrate, Lanthanum Trinitrate, Lanthanum Nitrate Hydrate, 10099‑59‑9

Lanthanum Nitrate, Lanthanum Trinitrate, Lanthanum Nitrate Hydrate, 10099‑59‑9

LANTHANUM(III) NITRATE (HYDRATE) 

Chemical Name: Lanthanum(III) Nitrate / Lanthanum Trinitrate
CAS Number: 10099-59-9
EC Number: 233-238-0
HS Code: 283429

1. PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY

2. CHEMICAL STRUCTURE AND EXPLANATION

Chemical Structure and Bonding:

Lanthanum(III) Nitrate is an ionic compound composed of one Lanthanum (La³⁺) cation and three Nitrate (NO₃⁻) anions. Lanthanum is in the +3 oxidation state (trivalent) in this compound. The molecule contains a variable number of water molecules of crystallization (typically 6 molecules - hexahydrate).

Molecular Formula Representation:

La(NO₃)₃·6H₂O (hexahydrate form)

This formula indicates the following structure:

• 1 Lanthanum ion (La³⁺): Central metal atom.

• 3 Nitrate groups (NO₃⁻): Trigonal planar anions.

• 6 Water molecules (H₂O): Water of crystallization bound to the crystal lattice.

Crystal Structure and Ionic Arrangement:

In the crystal structure, the La³⁺ ion is coordinated by oxygen atoms from nitrate groups and water molecules (typically 10-12 coordinate, due to lanthanum's large ionic radius). Nitrate ions act as bridges between lanthanum centers. The six water molecules are part of the crystal structure and impart specific thermal stability and solubility characteristics to the compound. Upon heating, these water molecules are sequentially removed (dehydration), eventually forming the anhydrous form.

Simplified Ionic Representation:

        La³⁺   NO₃⁻   H₂O
          \     /       /
           La(NO₃)₃ · 6H₂O
          /     \       \
        NO₃⁻   NO₃⁻   H₂O

(An ionic crystal lattice composed of 1 La³⁺ ion, 3 NO₃⁻ ions, and 6 water molecules)

Structural Properties:

Dehydration (Loss of Water upon Heating):

Lanthanum Nitrate Hydrate loses water sequentially when heated:

La(NO₃)₃·6H₂O → La(NO₃)₃·xH₂O → La(NO₃)₃ (anhydrous)

At higher temperatures, the nitrate groups decompose to form lanthanum oxide (La₂O₃) and nitrogen oxides (NOx).

3. PHYSICAL AND CHEMICAL PROPERTIES

Important Physical Notes:

• Lanthanum Nitrate is highly hygroscopic and rapidly absorbs moisture from the air, requiring special packaging and storage conditions.

• It has a low melting point (~60°C); when heated, it dissolves in its own water of crystallization, forming a clear liquid.

• It has high solubility in water and ethanol, making it suitable for various applications.

• It is not a strong oxidizer but exhibits oxidizing properties due to nitrate ions. Contact with organic materials should be avoided.

• High purity grades (≥ 99.9%) are available in rare earth element purity.

4. CHEMICAL PROPERTIES AND REACTIONS

Important Reactions:

1. Thermal Decomposition:

This reaction is the primary method used for producing lanthanum oxide.

First, dehydration:
La(NO₃)₃·6H₂O → La(NO₃)₃ + 6H₂O (approximately 60-200°C)

Then, thermal decomposition:
4 La(NO₃)₃ → 2 La₂O₃ + 12 NO₂ + 3 O₂ (high temperature, >600°C)

2. Reaction with Bases (Precipitation):

Lanthanum hydroxide precipitates, which can be used as an intermediate in lanthanum oxide production.

La(NO₃)₃ + 3 NaOH → La(OH)₃ ↓ + 3 NaNO₃

3. Dissolution and Hydrolysis in Water:

Hydrolysis of lanthanum ions causes the solution to become acidic.

La³⁺ + H₂O ⇌ La(OH)²⁺ + H⁺

4. Precipitation with Ammonia:

La(NO₃)₃ + 3 NH₃ + 3 H₂O → La(OH)₃ ↓ + 3 NH₄NO₃

5. Precipitation with Oxalate:

2 La(NO₃)₃ + 3 (NH₄)₂C₂O₄ → La₂(C₂O₄)₃ ↓ + 6 NH₄NO₃

5. APPLICATIONS AND INDUSTRIAL USES

5.1. Optical Glass and Materials (Most Important Application)

Lanthanum compounds are widely used in optical glass production due to their high refractive index and low dispersion properties. Lanthanum Nitrate is a precursor for these applications.

5.2. Phosphor and Luminescent Materials

Lanthanum compounds are used in phosphors and luminescent materials due to their special optical properties.

5.3. Catalyst Applications

5.4. Advanced Ceramics and Materials

5.5. Rare Earth Synthesis and Laboratory

5.6. Electronics

6. SECTORAL SUITABILITY TABLE

7. SAFETY AND TOXICOLOGY

Safety Precautions:

• Keep away from heat, sparks, and open flames.

• Store separately from combustible materials.

• Avoid dust formation.

• Work in well-ventilated areas.

• Use protective gloves, safety goggles, and dust mask.

• Wash hands thoroughly after handling.

• In case of eye contact, rinse with plenty of water for at least 15 minutes and seek medical attention.

• Avoid contact with organic materials.

8. STORAGE AND HANDLING

9. TRANSPORT AND REGULATORY INFORMATION

10. QUALITY AND PURITY

11. RAW MATERIALS AND DOWNSTREAM PRODUCTS

11.1. Raw Materials (Upstream)

11.2. Downstream Products

12. FIRST AID MEASURES

13. FIREFIGHTING MEASURES

14. ACCIDENTAL RELEASE MEASURES

15. SUMMARY AND CRITICAL WARNINGS

SUMMARY:

Lanthanum(III) Nitrate (La(NO₃)₃·xH₂O, CAS 10099-59-9) is an inorganic salt composed of one Lanthanum (La³⁺) and three Nitrate (NO₃⁻) ions, containing a variable number of water molecules of crystallization (typically hexahydrate). It appears as a white crystalline solid, is highly soluble in water and ethanol, and is hygroscopic (moisture-absorbing). It has a low melting point (~60°C) and dissolves in its own water of crystallization when heated.

Its most critical application areas include the production of optical glasses with high refractive index, phosphor and luminescent materials, petrochemical and automotive catalysts, and advanced ceramics. It is also widely used in rare earth element synthesis and as a laboratory reagent.

Under GHS classification, it is an oxidizer and harmful (H272, H302, H315, H319). Due to nitrate ions, it exhibits oxidizing properties and must be kept away from organic/reducing substances. Due to its hygroscopic nature, it must be stored in a cool, dry environment in tightly closed packaging. Appropriate Personal Protective Equipment (PPE) must be used during handling to avoid inhalation of dust and contact with skin/eyes.

Key Properties:

CRITICAL WARNINGS:

1. Oxidizing Property: Exhibits oxidizing properties due to nitrate ions. Contact with organic materials, reducing agents, and combustible materials must be avoided. May intensify fire (H272). Therefore, it must be stored separately and away from combustible and reducing materials.

2. Hygroscopic Property and Moisture Sensitivity: Highly hygroscopic and rapidly absorbs moisture from the air. Storage and weighing operations must not be performed in humid environments. After opening, the container must be quickly resealed and storage under an inert atmosphere (nitrogen, argon) is preferred. Moisture absorption compromises weighing accuracy and stoichiometry.

3. Low Melting Point and Thermal Instability: Melts at approximately 60°C by dissolving in its own water of crystallization. This is an important property to consider during thermal processes. At higher temperatures, nitrate groups decompose, releasing toxic nitrogen oxides (NO, NO₂). Thermal processes should be conducted in well-ventilated areas or under fume hoods.

4. Hydrated Structure and Stoichiometry: The product may contain a variable number of water molecules of crystallization (typically 6H₂O). Different hydrate forms have different molecular weights. The hydration state (xH₂O) must be considered when ordering and using the product. This difference must be taken into account in stoichiometric calculations.

5. Structure and Purity: High purity (≥ 99.9%) is critical for optical, catalyst, and ceramic applications. Impurities from other rare earth elements (cerium, neodymium, praseodymium) directly affect the performance of end products.

6. Dust Control: The powder form can irritate the lungs if inhaled. Dust control measures must be implemented in the work area (closed systems, local exhaust ventilation) and appropriate respiratory protection (dust mask or N95/FFP2) must be used.

7. Aqueous Solution Acidity: Aqueous solutions are acidic due to hydrolysis. Appropriate protective equipment should be used when working with acidic solutions, and base solutions should be available for neutralization.

8. Environmental Precautions: As a water-soluble salt, release into the environment (particularly water sources) must be prevented. Lanthanum compounds may exhibit toxic effects in aquatic environments. Waste solutions must not be discharged into sewers and must be disposed of according to local regulations.

9. Regulatory Compliance: Registration and notification requirements under REACH and KKDİK must be observed. It is classified as Class 5.1 (Oxidizing substance) under ADR/IMDG/IATA, requiring special labeling and documentation during transport. Use in food, cosmetics, and textile sectors is strictly prohibited.

10. Special Warning for Optical Glass Applications: In optical glass production, the thermal decomposition profile of lanthanum nitrate is very important. Controlled heating must ensure complete decomposition of nitrates and conversion to lanthanum oxide. Residual nitrate ions can cause bubbles and defects in the glass.

11. Special Warning for Catalyst Applications: In the synthesis of perovskite and other mixed oxide catalysts, the hydrate state and decomposition temperature of lanthanum nitrate affect the surface area and activity of the final catalyst. The synthesis protocol should be optimized according to these parameters.

Disclaimer: This Technical Data Sheet (TDS) is for informational purposes only. The information provided is based on available data and is believed to be accurate. However, the user is solely responsible for determining the suitability of the product for their specific applications and for complying with all applicable regulations and safety requirements. For complete safety, handling, storage, and regulatory compliance information, always refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier. Users are responsible for testing the product in their own processes and applications. All local, national, and international regulations must be followed when working with Lanthanum(III) Nitrate.