KNN-based (sodium potassium niobate-based) energy storage microcrystalline glass material with ultralow dielectric loss and preparation method

Abstract

The invention relates to a KNN-based (sodium potassium niobate-based) energy storage microcrystalline glass material with ultralow dielectric loss and a preparation method. The microcrystalline glass material is prepared from a glass phase and a crystal phase through mixing, fusing, cooling and molding, annealing, carrying out crystallization heat treatment, wherein according to mol percent, the glass phase accounts for 20 percent to 50 percent and the balance is the crystal phase; the crystal phase is composed of K2CO3, Na2CO3, Nb2O5 and BaCO3 at a mol ratio of (3-x) to (3-x) to 6 to 2x and x is more than 0 and less than or equal to 2.5. The KNN-based energy storage microcrystalline glass material prepared by the preparation method has extremely low dielectric loss; BaO is introduced, has the effect of adjusting the composition of the crystal phase of a sodium potassium niobate system and also has a certain promotion effect on a devitrification process and devitrification is accelerated by rare-earth metal ions; the BaO can also generate a pinning effect, and adverse impacts, caused by interface polarization, on breakdown and worsening are weakened; finally, the microcrystalline glass material with a high dielectric constant is obtained.

Description

[0001] 【Technical field】

[0002] The invention relates to the field of glass-ceramic materials, in particular to a KNN-based energy-storage glass-ceramic material with ultra-low dielectric loss and a preparation method thereof.

[0003] 【Background technique】

[0004] Pulse power supply is the core technology of pulse power system. Capacitor is an important energy storage component of pulse power system, and high specific energy capacitor is one of the key factors restricting the success of high-power pulse technology. Therefore, high specific energy capacitor dielectric materials have become a research hotspot in developed countries such as the United States [1]. (Smith, N.J., B. Rangarajan, M.T. Lanagan, C.G. Pantano. Alkali-free glass as a high energy density dielectric material [J]. Materials Lerrers, 2009, (63): 1245-1248.)

[0005] Although foil structure capacitors or metallized film capacitors currently used in high-power pulse power supply systems have been mass-prod...

Images