Barium titanate (BaTiO₃) with the CAS number 12047 - 27 - 7 is a well - known inorganic compound. It exists as a white powder under normal conditions. The molecular weight of barium titanate is approximately 233.19 g/mol. It has a perovskite crystal structure, which is crucial for its unique physical properties.
The density of barium titanate is around 6.02 g/cm³. It has a high melting point of about 1625 °C, indicating its thermal stability. In terms of solubility, it is insoluble in water but can react with strong acids. The dielectric constant of barium titanate is extremely high, which makes it highly valuable in electrical applications.
One of the most important applications of barium titanate is in the electronics industry. It is widely used in the production of capacitors. Its high dielectric constant allows capacitors made from barium titanate to store a large amount of electrical energy in a relatively small space. This is essential for the miniaturization of electronic devices such as smartphones, laptops, and tablets.
Barium titanate is also used in the manufacturing of piezoelectric devices. Piezoelectric materials can convert mechanical stress into electrical energy and vice versa. This property is utilized in sensors, actuators, and ultrasonic transducers. For example, in ultrasonic cleaning machines, barium titanate - based transducers convert electrical signals into ultrasonic waves for effective cleaning.
In addition, barium titanate can be used in thermistors. Thermistors are temperature - sensitive resistors. The electrical resistance of barium titanate changes with temperature, which can be exploited to measure and control temperature in various systems.
When using barium titanate in capacitor production, it is first mixed with appropriate binders and additives to form a paste. This paste is then coated onto electrodes and sintered at high temperatures to form the capacitor structure. The sintering process is crucial as it affects the crystal structure and electrical properties of the final product. The temperature and atmosphere during sintering need to be carefully controlled.
For piezoelectric device manufacturing, barium titanate powder is usually pressed into a desired shape and then poled. Poling is a process of applying a strong electric field to align the electric dipoles in the material, which is essential for the piezoelectric effect. After poling, the device can be integrated into the relevant circuit or system.
In the case of thermistors, barium titanate is made into a small ceramic element. The element is then connected to electrical leads, and appropriate packaging is done to protect it from the environment. The thermistor can then be installed in a temperature - sensing circuit.
Case 1: Smartphone Capacitors
A leading smartphone manufacturer was facing challenges in reducing the size of its capacitors while maintaining high performance. By switching to barium titanate - based capacitors, they were able to reduce the volume of capacitors by 30%. This allowed for more space inside the smartphone for other components, such as larger batteries. The high dielectric constant of barium titanate ensured that the electrical performance of the capacitors remained excellent, resulting in improved overall device performance.
Case 2: Ultrasonic Cleaning Machine
An ultrasonic cleaning machine manufacturer wanted to improve the efficiency of their machines. By using barium titanate - based ultrasonic transducers, they were able to generate more powerful and uniform ultrasonic waves. This led to a significant reduction in cleaning time and an improvement in cleaning quality. The durability of the barium titanate transducers also reduced maintenance costs.
Case 3: Temperature Control in Industrial Ovens
An industrial oven manufacturer needed a reliable thermistor for temperature control. Barium titanate thermistors were installed in the ovens. The precise temperature - resistance relationship of barium titanate allowed for accurate temperature measurement and control. This ensured that the ovens maintained a consistent temperature, resulting in better - quality products during the heating process.
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