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Sodium Fluoride Evaporation Materials

Sodium Fluoride Evaporation Materials, NaF

Material: Sodium Fluoride (NaF)
Chemical Formula: NaF
Catalog No.: TFM-EVM-0275
Purity: 99.9%
Shape: Powder/ Granule/ Custom-made

Sodium Fluoride (NaF) evaporation material is supplied by Thin Film Materials (TFM) for vacuum evaporation and thin-film deposition. Available form, size, purity, and packaging can be customized to suit research and production requirements.

MSDS File

Product Overview

Sodium Fluoride Evaporation Materials (NaF) is a fluoride evaporation material commonly considered for optical and functional thin-film deposition. Fluoride sources can be sensitive to source cleanliness, moisture pickup, spitting, and crucible compatibility depending on the compound and heating method. A controlled vacuum, gradual preconditioning, and stable evaporation rate help reduce particles and improve repeatability.

Evaporation Behavior and Process Considerations

Fluoride charges should be loaded into compatible, clean source hardware and conditioned gradually. Depending on the material, resistance heating or electron-beam evaporation may be used. Stable vacuum and rate control are important because moisture or trapped gases can increase spitting and film defects during initial heating.

Technical Data

ParameterTypical Value / RangeImportance
Purity99.9% – 99.99%Ensures defect-free, stable optical coatings
Particle/Form SizePellets/Tablets (2–6 mm)Enables uniform evaporation
Evaporation MethodE-beam / ThermalSuitable for multiple deposition systems
AppearanceWhite crystalline solidCharacteristic of NaF
MaterialKey AdvantageTypical Application
Sodium Fluoride (NaF)Low refractive index, broad transparencyAR coatings, optics
Lithium Fluoride (LiF)Excellent UV transmissionDeep-UV optics, windows
Calcium Fluoride (CaF₂)High laser damage thresholdLaser and IR optics
QuestionAnswer
What forms are available?Pellets, tablets, and granules suitable for thermal or e-beam evaporation.
What is the lead time?Standard delivery is 1–2 weeks depending on order size.
Is NaF hygroscopic?Slightly; it should be stored in a dry, sealed container.
How is it packaged?Vacuum-sealed with desiccants, cushioned with foam, and shipped in export-safe cartons.
Which industries use NaF evaporation materials?Optics, lasers, displays, and advanced R&D.

Typical Thin-Film Applications

  • Optical thin-film stacks and wavelength-control coatings
  • Dielectric, protective, UV, visible, or infrared coating research depending on the fluoride
  • Multilayer designs requiring low-absorption inorganic evaporation materials

Source Form and Ordering Considerations

For quotation, provide the material or formula, purity, desired source form and size, quantity, evaporation method if known, and any crucible, boat, or e-beam hearth constraints. For compound materials, include the target film composition or application when possible so that source form and process risk can be reviewed together. TFM can supply pellets, pieces, granules, tablets, or other custom forms subject to material manufacturability.

Frequently Asked Questions

Is Sodium Fluoride used for optical evaporation coatings?

Many fluoride materials are used in optical thin-film stacks because of their useful refractive-index and transmission characteristics. The actual suitability depends on wavelength range and film design.

Can Sodium Fluoride be thermally evaporated?

Some fluorides can be processed by resistance heating, while others are evaporated by electron beam. The choice depends on melting behavior, vapor pressure, rate requirement, and source compatibility.

Why is gradual preconditioning important for Sodium Fluoride?

Fluoride charges can release adsorbed moisture or trapped gas during initial heating. A slow ramp helps reduce pressure spikes, spitting, and particle defects.

Does crucible material matter for Sodium Fluoride?

Yes. The evaporation source should be chemically and thermally compatible with the fluoride at operating temperature to reduce contamination or reaction.

Can film composition differ from the fluoride source?

It can, depending on dissociation behavior and deposition conditions. Film optical properties should therefore be checked against the coating specification rather than inferred only from source chemistry.

What should I specify when ordering Sodium Fluoride evaporation material?

Provide purity, source form and size, quantity, evaporation method, crucible or boat constraints, and the optical-coating application if relevant.

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FAQ

  • They are high‐purity substances (e.g. metals, alloys, or compounds) used in thermal or electron‐beam evaporation processes to form thin films on substrates.

  • Typically, they’re processed into a form (often ingots, pellets, or wires) that can be efficiently vaporized. Preparation emphasizes high purity and controlled composition to ensure film quality.

  • Thermal evaporation and electron-beam (e-beam) evaporation are the two main techniques, where material is heated (or bombarded with electrons) until it vaporizes and then condenses on the substrate.

  • Thermal evaporation heats the material directly (often using a resistive heater), while e-beam evaporation uses a focused electron beam to locally heat and vaporize the source material—each method offering different control and energy efficiency.

  • Key parameters include source temperature, vacuum level, deposition rate, substrate temperature, and the distance between the source and the substrate. These factors influence film uniformity, adhesion, and microstructure.

  • Evaporation generally produces high-purity films with excellent control over thickness, and it is especially suitable for materials with relatively low melting points or high vapor pressures.

  • Challenges include issues with step coverage (due to line-of-sight deposition), shadowing effects on complex topographies, and possible re-evaporation of material from the substrate if temperature isn’t properly controlled.

  • Common evaporation materials include noble metals (e.g., gold, silver), semiconductors (e.g., silicon, germanium), metal oxides, and organic compounds—each chosen for its specific optical, electrical, or mechanical properties.

  • Selection depends on desired film properties (conductivity, optical transparency, adhesion), compatibility with the evaporation process, and the final device application (semiconductor, optical coating, etc.).

  • Optimizing substrate temperature, deposition rate, and chamber vacuum are critical for ensuring that the film adheres well and forms the intended microstructure without defects.

  • Troubleshooting may involve checking the source material’s purity, ensuring stable source temperature, verifying the vacuum level, adjusting the substrate’s position or temperature, and monitoring deposition rate fluctuations.

While evaporation tends to yield very high purity films with excellent thickness control, it is limited by its line-of-sight nature. In contrast, sputtering can deposit films more uniformly on complex surfaces and is more versatile for a broader range of materials.

 

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