Industrial Grade 97% High-Purity Grade 99% Electronic Grade 99.99% Strontium carbonate CAS 1633-05-2

 What is Strontium carbonate? How does it work?

Strontium carbonate (chemical formula SrCO3) is the most important industrial compound of strontium, a white or gray powder. In the electronics industry, strontium carbonate is a key raw material for high-purity electronic ceramics, multilayer ceramic capacitors, fluorescent materials, and special electronic glasses—electronic-grade strontium carbonate contributes to the production of thousands of MLCC capacitors in mobile phones, temperature control devices in air conditioners and refrigerators, and radiation-proof glass shells in old-fashioned color TVs.

Basic identification information: Molecular formula SrCO3, molecular weight 147.63, CAS number 1633-05-2, EC number 216-643-7; It exists naturally as strontianite, and is industrially produced and purified from celestite (SrSO4) through the black lime method or direct conversion method.

Physically, strontium carbonate is a white or gray powder, odorless and tasteless; density 3.5 g/cm³; melting point 1494℃ (decomposes into SrO and CO2); almost insoluble in water (approximately 3.4 mg/100 mL, Ksp 5.6 × 10⁻¹⁰), soluble in dilute acids (releasing CO2) and ammonium salt solutions; refractive index 1.518, orthorhombic crystal system.

Chemically, strontium carbonate is a weak base (weak Lewis base): it reacts with various acids to form corresponding strontium salts and release CO2 (with nitric acid to form strontium nitrate, with hydrochloric acid to form strontium chloride); it reacts with high-temperature solids such as titanium dioxide to form strontium titanate (SrTiO3); the strontium ion radius (approximately 0.118 nm) is between that of calcium (0.100 nm) and barium (0.135 nm), and this "middle" size allows for precise adjustment of the lattice and Curie temperature in barium titanate-based ceramics. Storage must be moisture-proof and avoid direct mixing with strong acids.

From the perspective of its mechanism of action, electronic-grade strontium carbonate plays an irreplaceable role through "strontium ion lattice substitution + perovskite structure formation," and its mechanism of action in different applications is as follows:

1.Perovskite dielectric mechanism (SrTiO3 formation)

Strontium carbonate reacts with titanium dioxide in a high-temperature solid-state reaction to form perovskite-type strontium titanate (SrTiO3). Its high dielectric constant (approximately 300), low dielectric loss, and tunable dielectric-temperature characteristics make it a fundamental material for electronic ceramics and thin-film dielectrics.

2.Curie temperature regulation mechanism (MLCC formulation control)

Strontium ions have a smaller radius (0.118 nm) than barium ions (0.135 nm). By partially substituting barium ions into barium titanate lattices, the Curie temperature (Tc) can be shifted towards lower temperatures, thereby obtaining temperature-stable (X7R/X5R type) media. This is the core method for MLCC formulation design.

3.High-dielectric thin film mechanism (storage device medium)

Electronic-grade SrTiO3 thin films with high dielectric constant, low leakage current and good temperature stability are suitable as dielectric materials for memory devices (DRAM capacitors). High purity strontium sources are used as precursors for thin film deposition (PVD/MOCVD, etc.).

4.Doping mechanism of luminescent centers (fluorescent materials)

Strontium carbonate is calcined to SrO which reacts with sulfur and rare earth dopants (e.g. europium) to form SrS based phosphors. The strontium ion lattice is a good crystal field for the rare earth luminescent centers to obtain blue-green luminescence and long afterglow characteristics.

5.Mechanism of superconducting phase formation (BSCCO system)

Strontium ions participate in the construction of the layered structure of the bismuth-strontium-calcium-copper-oxygen (BSCCO) superconducting phase and are an indispensable lattice component in high-temperature superconducting materials. High-purity strontium sources ensure the purity of the superconducting phase and the critical current density.

In summary,electronic-grade strontium carbonate is a "high-purity strontium source for electronic ceramics and electronic materials."  Its strontium ion lattice substitution and perovskite structure are employed in core electronic manufacturing processes ranging from MLCCs to temperature control devices, from storage media to fluorescent materials, and from superconductors to optical glass.

What are the uses of electronic-grade Strontium carbonate?

1.Electronic ceramics raw material of strontium titanate (main application in electronic ceramics field)

Application Field: Electronic Components, Electronic Ceramics

Corresponding Products: Strontium titanate SrTiO3 ceramic powder, PTC thermistors (for air-conditioners, refrigerators, automotive temperature control and heating), piezoelectric ceramics, microwave dielectric ceramics, grain boundary layer capacitors, thyristor buffer capacitor ceramics

Applicability Principle: Strontium carbonate reacts with titanium dioxide to produce perovskite-type strontium titanate. Thanks to its high dielectric constant, tunable dielectric-temperature performance and piezoelectricity, it acts as a fundamental electronic ceramic material. High-purity electronic-grade strontium sources ensure uniform dielectric properties and high device yield.

2.MLCC (Multilayer Ceramic Capacitor) Formula Optimization (Core Application in Electronic Components)

Application Field: Chip Components & Consumer Electronic Devices

Corresponding Products: X7R / X5R temperature-stable MLCC multilayer ceramic capacitors, barium titanate based dielectric formulations, surface mount capacitors for mobile phones, computers and automotive electronics

Applicability Principle: Strontium ions are smaller than barium ions. Partial substitution of barium in the barium titanate lattice reduces the Curie temperature and flattens the dielectric-temperature curve, achieving temperature-stable dielectrics. This is a primary approach to regulate the temperature performance of MLCC dielectric formulations. Electronic-grade purity ensures stable capacitance and high reliability of capacitors.

3.High-dielectric thin films and storage device media (semiconductor and memory sectors)

Application Field: Semiconductor Memory Devices & Manufacturing Technology

Corresponding Products: High dielectric SrTiO3 thin films, DRAM capacitor dielectric layers, semiconductor process precursors, high-k gate dielectric research materials

Applicability Principle: SrTiO3 thin films feature high dielectric constant, low leakage current and good temperature stability, which makes them suitable for capacitor dielectrics in memory devices. Electronic-grade strontium carbonate serves as a high-purity strontium source; ultra-low impurity levels guarantee the electrical performance of thin films. It is therefore an important material for advanced memory and high-k dielectric research.

4.Glass shell for CRT and radiation protection glass (electronic display and protection glass industry)

Application Field: X-ray Protection, Electronic Display Glass

Corresponding Products: CRT TV/monitor shell glass, X-ray protection glass, iridescent glass

Applicability Principle: Strontium has a high atomic number. Incorporated into glass networks, it effectively absorbs X-rays generated by cathode ray tubes and modifies glass refractive index and melting properties. It was once an essential ingredient for TV envelope glass. Although consumption declined after CRTs were phased out, it remains in use for X-ray shielding glass.

5.Phosphors and luminescent materials (core applications in the field of optoelectronic materials)

Application Field: Display Lighting & Optoelectronics

Corresponding Products: SrS:Eu blue/green phosphors, electroluminescent materials, long-afterglow phosphors, luminescent coatings, X-ray intensifying screen phosphors, LED phosphor systems

Applicability Principle: After calcination into strontium oxide, strontium carbonate reacts with sulfur and rare-earth dopants (europium, etc.) to form SrS-based phosphors. The strontium ion lattice provides an appropriate crystal field for rare-earth luminescent centers to realise blue-green emission and long afterglow characteristics. High-purity electronic-grade strontium sources guarantee luminous efficiency and colour purity.

6.Precursors for high-temperature superconducting materials (in the field of superconducting materials)

Application Field: Superconducting Materials & Cutting-edge Electronics

Corresponding Products: BSCCO (Bi-Sr-Ca-Cu-O) high-temperature superconducting precursors, superconducting tapes and wires, superconducting thin films, MRI superconducting magnet related materials

Applicability Principle: Strontium carbonate is the strontium source for the bismuth-strontium-calcium-copper-oxygen (BSCCO) high-temperature superconductor system. Strontium ions take part in constructing the layered structure of the superconducting phase. High-purity electronic-grade strontium feedstock ensures superconducting phase purity, critical temperature and critical current density, making it one of the key raw materials for manufacturing high-temperature superconducting tapes.

7.High-refractive-index optical glass (optics and optoelectronics fields)

Application Field: Optical Glass & Optoelectronic Instruments

Corresponding Products: High-refractive-index, low-dispersion optical glass, camera lenses and telescope lenses, optical prisms and filters, special optical components

Applicability Principle: Strontium ions have medium ionic radius and high electronic polarizability. Introducing strontium ions into glass networks raises the refractive index and adjusts dispersion. Electronic-grade purity eliminates colouring ions and bubble defects, ensuring high transmittance and excellent imaging quality of optical glass.

In summary, electronic-grade strontium carbonate SrCO3, CAS 1633-05-2) is a high-purity strontium source for electronic ceramics and materials. It relies on strontium ion lattice substitution and perovskite structure formation, with mature applications across seven major sectors: strontium titanate electronic ceramics, MLCC Curie temperature tuning, high-dielectric thin films and storage media, electronic display and protective glass, phosphors and luminescent materials, high-temperature superconducting materials, and high-refractive-index optical glass. Among these, strontium titanate electronic ceramics and MLCC formulation adjustment represent the largest current market demand, widely adopted in electronic components for mobile phones, home appliances and automotive electronics.