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Barium Strontium Titanate Evaporation Materials

Barium Strontium Titanate Evaporation Materials, Ba0.5Sr0.5TiO3

Material: Barium Strontium Titanate (Ba0.5Sr0.5TiO3)
Chemical Formula: Ba0.5Sr0.5TiO3
Catalog No.: TFM-EVM-0028
Purity: 99.9%
Shape: Powder/ Granule/ Custom-made

Barium Strontium Titanate (Ba0.5Sr0.5TiO3) 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

Barium Strontium Titanate Evaporation Materials (Ba0.5Sr0.5TiO3) is a ceramic evaporation material for depositing oxide thin films used in optical, dielectric, electronic, magnetic, protective, or research applications. Many oxides have high melting temperatures and can partially dissociate or lose oxygen during evaporation, making electron-beam evaporation a common process option. Source density, pellet or piece geometry, crucible compatibility, oxygen background, deposition rate, and substrate conditions can all affect film stoichiometry and microstructure.

Evaporation Behavior and Process Considerations

Electron-beam evaporation is frequently evaluated for ceramic oxides because many have high melting temperatures. During heating, oxygen can be lost or the source can partially dissociate, so oxygen partial pressure, substrate temperature, deposition rate, and any post-deposition anneal may need optimization. The source should be conditioned gradually to minimize cracking, spitting, and sudden outgassing.

Technical Data

ParameterTypical Value / RangeImportance
Chemical FormulaBa₀.₅Sr₀.₅TiO₃Defines dielectric behavior
Purity99.9% – 99.99%Minimizes impurity phases
Density≥ 95% theoretical densityStable evaporation & uniform films
FormPellets / Pieces / GranulesCompatible with evaporation systems
Deposition MethodElectron Beam EvaporationThin film fabrication
Dielectric ConstantComposition-dependentDetermines tunability
Curie TemperatureAdjustable via Ba/Sr ratioControls phase transition
MaterialKey AdvantageTypical Application
Ba₀.₅Sr₀.₅TiO₃ (BST)Tunable dielectric constantRF & microwave devices
BaTiO₃Strong ferroelectric behaviorCapacitors & actuators
SrTiO₃Quantum paraelectric behaviorSubstrates & dielectric studies
Pb(Zr,Ti)O₃ (PZT)High piezoelectric performanceActuators & memory
QuestionAnswer
Can the Ba/Sr ratio be customized?Yes, compositions can be tailored to achieve specific dielectric or phase transition characteristics.
Is BST suitable for electron beam evaporation?Yes, high-density ceramic forms are optimized for stable e-beam deposition.
How is stoichiometry maintained during evaporation?Material density and processing are controlled to reduce compositional deviation.
Can small R&D quantities be supplied?Yes, flexible quantities are available for laboratory research.
How is it packaged?Vacuum-sealed, moisture-protected packaging ensures material stability during transport.

Typical Thin-Film Applications

  • Optical, dielectric, transparent conductive, magnetic, protective, or functional oxide films
  • Displays, photovoltaics, sensors, semiconductors, and multilayer optical coatings where applicable
  • Research on composition, oxygen content, phase, and post-deposition treatment

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 Barium Strontium Titanate commonly evaporated by electron beam?

Electron-beam evaporation is frequently evaluated for high-melting ceramic oxides because it can provide localized heating. The exact method depends on the oxide, source form, and required film properties.

Can Barium Strontium Titanate lose oxygen during evaporation?

Yes. Some oxides can partially dissociate or become oxygen-deficient under vacuum heating. Oxygen partial pressure, substrate temperature, deposition rate, and post-annealing can influence the final film composition.

Why can oxide evaporation sources spit or crack?

Rapid heating, trapped gas, porosity, and thermal gradients can cause cracking or particle ejection. A gradual conditioning ramp and stable source geometry help reduce these effects.

Does the deposited film always match the composition of Ba0.5Sr0.5TiO3?

Not always. Preferential evaporation, oxygen loss, decomposition, and substrate conditions can shift film chemistry or phase relative to the source material.

What source form is suitable for Barium Strontium Titanate?

Pellets, tablets, pieces, or granules may be used depending on the e-beam pocket or crucible. A dense and mechanically stable source form is usually easier to condition reproducibly.

What information should I provide for a Barium Strontium Titanate quotation?

Provide formula or composition, purity, source form and size, quantity, evaporation method, source-holder dimensions, and any film-composition or documentation requirements.

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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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