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Holmium Acetate, Holmium Triacetate, Holmium Acetate Hydrate, 25519‑09‑9

Holmium Acetate, Holmium Triacetate, Holmium Acetate Hydrate, 25519‑09‑9

HOLMIUM ACETATE 

1. PRODUCT IDENTIFICATION AND CHEMICAL IDENTITY

Parameter Information
Product Name Holmium Acetate
Chemical Name Holmium(III) Acetate
Other Names Holmium Triacetate, Holmium Acetate Hydrate
CAS Number 25519-09-9
EC Number Not available
HS Code 291529
Molecular Formula Ho(CH₃COO)₃·xH₂O (typically hydrated form)
Molecular Weight ~292 g/mol (anhydrous basis)
Purity ≥ 99% (rare earth purity)
Appearance Light yellow-pink crystalline solid
Odor Slight acetic acid odor
Physical State (20°C) Solid (crystalline)

2. CHEMICAL STRUCTURE

2.1. Molecular Structure

Holmium acetate is the acetate salt of holmium. Holmium ions (Ho³⁺) and acetate ions (CH₃COO⁻) are present in a 1:3 ratio. The compound typically exists as a hydrate with variable water content. It is hygroscopic and readily absorbs moisture from the air. Holmium salts are characterized by their light yellow-pink coloration due to the unique electronic configuration of the Ho³⁺ ion.

Structural Formula:

                    HOLMIUM ACETATE [Ho(CH₃COO)₃·xH₂O]
                               |
                     Ho³⁺ - CH₃COO⁻ Ionic Bonds
                               |
             +----------------+----------------+
             |                |                |
         Organic Salt        Hygroscopic       Acidic
         Structure           Property          Salt

2.2. Structural Properties

Parameter Value
Oxidation State Ho³⁺ (Holmium +3)
Molecular Weight ~292 g/mol (anhydrous)
Water Content Variable (typically x = 4)
Appearance Light yellow-pink crystalline solid
Density ~2.5–2.7 g/cm³
pH (aqueous solution) Slightly acidic
Color Origin f-f transitions of Ho³⁺ ion

3. PHYSICAL AND CHEMICAL PROPERTIES

Property Value Description
Appearance Light yellow-pink crystalline solid -
Odor Slight acetic acid odor -
Chemical Formula Ho(CH₃COO)₃·xH₂O -
Molecular Weight ~292 g/mol (anhydrous) -
Density ~2.5–2.7 g/cm³ -
Melting Point Decomposes upon heating -
Solubility in Water Soluble -
Solubility in Acetic Acid Soluble -
Solubility in Ethanol Slightly soluble -
Hygroscopicity High Absorbs moisture from air
Stability Stable under normal conditions; sensitive to moisture and light -
pH (aqueous solution) Slightly acidic -
Thermal Decomposition Decomposes to holmium oxide (Ho₂O₃) -

4. STABILITY AND REACTIVITY

Parameter Information
Chemical Stability Stable under normal conditions
Conditions to Avoid Moisture, high temperature, strong oxidizing agents
Incompatible Materials Strong bases, strong oxidizing agents, reducing agents
Hazardous Decomposition Products Holmium oxide (Ho₂O₃), carbon dioxide, acetic acid vapors
Hazardous Polymerization Will not occur
Hygroscopicity High; absorbs moisture from air
Photosensitivity Moderate

4.1. Chemical Reactions

Thermal Decomposition:

2Ho(CH₃COO)₃·xH₂O → Ho₂O₃ + 3CO₂↑ + 3CH₃COCH₃↑ + xH₂O↑

Reaction with Alkali:

Ho(CH₃COO)₃ + 3NaOH → Ho(OH)₃↓ + 3CH₃COONa

Reaction with Phosphate:

Ho(CH₃COO)₃ + Na₃PO₄ → HoPO₄↓ + 3CH₃COONa

5. APPLICATION AREAS

5.1. Production of Holmium Compounds (Precursor)

Application Function Details
Holmium Oxide (Ho₂O₃) Production Precursor High-purity holmium oxide production
Holmium Phosphate (HoPO₄) Production Precursor Phosphor and laser applications
Mixed Rare Earth Compounds Precursor Specialty mixed oxides

5.2. Optics and Photonics

Application Function Details
Laser Crystals Laser medium Ho³⁺ doped laser crystals for 2 µm wavelength lasers
Optical Fibers Signal amplification Holmium-doped fiber amplifiers for telecommunications
Solid-State Lasers Laser material Ho:YAG, Ho:YLF, and other holmium-doped laser crystals
Infrared Emitters IR source Holmium-based infrared emitting materials
Optical Glass Optical additive Enhances optical properties

5.3. Magnetic Materials

Application Function Details
Magnetic Refrigeration Magnetic material Holmium has strong magnetic properties; used in magnetic refrigeration
Specialty Magnets Magnetic component Holmium-containing magnetic materials
Research Magnets Research material Magnetic property studies

5.4. Advanced Ceramics and Specialty Glass

Application Function Details
Advanced Ceramics Performance enhancer Specialty ceramic components
Specialty Glass Optical additive Infrared and optical glasses
Refractory Materials Heat resistance High-temperature applications

5.5. Laboratory and Research

Application Function Details
Laboratory Reagent Rare earth research Used as a reagent in rare earth chemistry
Precursor Compound Starting material Synthesis of other holmium compounds
Advanced Materials Research Research material Development of new materials
Standard Preparation Reference material Calibration and analysis

6. SECTOR SUITABILITY TABLE

Sector / Application Suitability Description
Textile Not Suitable No application area
Food Not Suitable Prohibited in food additives or food contact materials
Cosmetics Not Suitable Prohibited in cosmetic formulations under CLP/REACH
Metal / Surface Treatment Suitable Can be used in specialty alloys and coatings
Ceramics / Glass Suitable Used in advanced ceramics and specialty glass production
Laboratory / Research Suitable Widely used as reagent in rare earth chemistry
Electronics / Optics Suitable Critical use in laser crystals, optical fibers, and photonics
Construction Chemicals Not Suitable No application area

7. STORAGE AND SHELF LIFE

Parameter Condition
Storage Conditions Store in a cool, dry, well-ventilated area
Container Requirements Sealed, moisture-proof containers
Light Protection Protect from light
Moisture Protection Store with desiccant; hygroscopic
Temperature Room temperature (15-25°C)
Shelf Life Approximately 2 years under proper conditions
Stability Note Hygroscopic; may absorb moisture if exposed to humid air

8. PACKAGING OPTIONS

Packaging Type Quantity Material
Glass Bottle 10 g, 50 g, 100 g Amber glass with desiccant
Plastic Container 100 g, 500 g, 1 kg HDPE container, moisture-proof
Fiber Drum 5 kg, 10 kg, 25 kg PE-lined, moisture-proof

9. SAFETY AND TOXICOLOGY

Parameter Value
Acute Oral Toxicity (LD50, Rat) > 2,000 mg/kg (low toxicity)
Dermal Toxicity Low
Skin Irritation Mild irritant (H315)
Eye Irritation Mild to severe irritant (H319)
Inhalation Dust may cause respiratory irritation
Carcinogenicity Not classified as a carcinogen
Mutagenicity Not mutagenic
Chronic Effects May cause liver effects at high doses
Environmental Hazards Low to moderate toxicity to aquatic life

10. GHS CLASSIFICATION

Hazard Class Category H-Statement
Skin Irritation Category 2 H315: Causes skin irritation
Eye Irritation Category 2 H319: Causes serious eye irritation

Signal Word: WARNING

Hazard Pictograms: GHS07 (Exclamation Mark)

11. PRECAUTIONARY STATEMENTS (P-CODES)

Code Statement
P261 Avoid breathing dust
P264 Wash hands thoroughly after handling
P271 Use only in well-ventilated areas
P280 Wear protective gloves/eye protection/face protection
P302+P352 IF ON SKIN: Wash with plenty of soap and water
P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present
P337+P313 If eye irritation persists: Get medical advice/attention
P501 Dispose of contents/container in accordance with local regulations

12. FIRST AID MEASURES

Route of Exposure Action to Be Taken
Inhalation Move to fresh air. If symptoms persist, seek medical attention
Skin Contact Wash with plenty of soap and water. Remove contaminated clothing
Eye Contact Rinse thoroughly with plenty of water for at least 15 minutes. Remove contact lenses. If irritation persists, seek medical attention
Ingestion Rinse mouth. Drink plenty of water. If large amount is swallowed, seek medical attention

13. REGULATORY STATUS

Region / Authority Status
European Union (REACH) Registration required
Turkey (KKDIK) Compliance required
TSCA (USA) Registered
Food / Cosmetics Not approved

14. OTHER NAMES AND SYNONYMS

  • Holmium(III) Acetate

  • Holmium Triacetate

  • Holmium Acetate Hydrate

  • Ho(CH₃COO)₃·xH₂O

15. QUICK REFERENCE TABLE

Property Value
CAS Number 25519-09-9
HS Code 291529
Molecular Formula Ho(CH₃COO)₃·xH₂O
Molecular Weight ~292 g/mol (anhydrous)
Appearance Light yellow-pink crystalline solid
Density ~2.5–2.7 g/cm³
Water Solubility Soluble
Purity ≥ 99%
Hygroscopicity High
GHS Signal Word WARNING

16. CRITICAL NOTICES AND BEST PRACTICES

CRITICAL NOTICES:

  1. Holmium acetate is highly hygroscopic. Must be stored in moisture-proof containers with desiccant.

  2. Protect from light to prevent degradation.

  3. Decomposes at high temperatures to holmium oxide (Ho₂O₃).

  4. Causes skin and eye irritation. Use appropriate personal protective equipment.

  5. Dust may cause respiratory irritation. Use in well-ventilated areas.

  6. Primarily used in research, optics, photonics, and magnetic material applications.

  7. Holmium has strong magnetic properties, making its compounds valuable for magnetic refrigeration and specialty magnet applications.

BEST PRACTICE RECOMMENDATIONS:

Storage:

  • Store in a cool, dry, well-ventilated area

  • Use sealed, moisture-proof containers with desiccant

  • Protect from light

  • Store at room temperature (15-25°C)

Handling:

  • Use in well-ventilated areas

  • Use dust mask, protective goggles, and gloves

  • Avoid dust formation

  • Wash hands after handling

  • Immediately reseal container after use

Waste Management:

  • Dispose in accordance with local regulations

  • Consider rare earth recovery for large quantities

LEGAL DISCLAIMER

This Technical Data Sheet (TDS) is for informational purposes only and is prepared based on available technical data. The user is solely responsible for determining the suitability of the product for their specific application and for complying with all local, national, and international regulations. For complete safety, storage, handling, transport, waste, and regulatory compliance information, the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier must be consulted. This document does not substitute professional advice. Holmium acetate is a specialty rare earth compound; appropriate precautions must be taken during handling.

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