
Barium titanate, with the molecular formula BaTiO₃, is a white or off-white crystalline powder that is odorless and tasteless. It is insoluble in water and alkaline solutions but soluble in concentrated sulfuric acid and hydrofluoric acid. It exhibits high dielectric constant, ferroelectric, piezoelectric, and thermosensitive semiconductor properties. It is primarily used in the manufacture of electronic ceramics, multilayer ceramic capacitors, piezoelectric components, thermistors, and microwave dielectric devices.
| Item | Specification |
| Melting Point | 1625 °C |
| Boiling Point | N/A |
| Density | 6.08 g/mL at 25 °C(lit.) |
| Bulk density | 1400 kg/m³ |
| Vapor pressure | 0 Pa at 20 °C |
| Curie temperature | 120 °C (Tetrahedral crystal system) |
| Dielectric constant | ~4000 (varies significantly among different crystal forms) |
| Solubility | Soluble in concentrated sulfuric acid, hydrochloric acid, and hydrofluoric acid; insoluble in hot dilute nitric acid, water, and alkalis. |
Dielectric materials for multilayer ceramic capacitors (MLCCs)
Fabrication of piezoelectric ceramic components, ultrasonic transducers, and sensors
Positive temperature coefficient (PTC) thermistors and temperature control devices
Microwave dielectric ceramics, ferroelectric memory, and optoelectronic devices
Piezoelectric ceramic filters, resonators, and electronic ceramic components
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