What is the usage of gadolinium?--1>

An important property of gadolinium is that each of the seven orbitals has one electron, the largest number of unpaired electrons in the rare earth element. The magnetic moment that depends on this unpaired electron is the largest, and it is expected that this characteristic can be effectively utilized.

In medical applications, the complex of gadolinium-diethylenediaminepentaacetic acid (DTPA) can be used as an MRI (Magnetic Resonance Imaging Diagnosis) screen shade adjuster just like the X-ray contrast agent barium. That is to say, the water around gadolinium is affected by the magnetic field moment of the gadolinium nucleus, showing that it is different from the water that is not affected, and using the control screen is helpful for the diagnosis of the disease.

Industrial field: The well-known industrial technology called magnetic freezing is to use magnetic field to generate heat when it becomes a magnet, and to remove the heat-absorbing property of magnetic field when the magnetic disappears for cooling. Small and efficient refrigerators can be made. In the magnetic bubble memory device, gadolinium-potassium-garnet is used as the media substance. Magnetic bubble memory is to add a magnetic field in the vertical direction of the material to make it into a cylindrical magnetic field, strengthen the magnetic field, and soon produce the phenomenon that the magnetic field disappears. Information can be stored using magnetic bubble memory devices, which are generally used for information collection.

Other uses of gadolinium are in optical fibers and optical discs, along with terbium and dysprosium. Optical magnetic recording is to use light to replace the magnetic reading magnetization and non-magnetization, which has the characteristics of high density and rewritable recording.

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