Niobium capacitor and method of manufacture thereof

Details Niobium capacitor and method of manufacture thereof Niobium capacitor and method of manufacture thereof

H - Electricity

01

G

H01G 9/038 (2006.01) C04B 35/495 (2006.01) H01G 4/12 (2006.01) H01G 9/00 (2006.01) H01G 9/04 (2006.01) H01G 9/052 (2006.01) H01G 9/07 (2006.01) H01L 29/43 (2006.01) H01L 51/05 (2006.01)

Patent

CA 2360789

A capacitor having a large capacity per unit weight and good LC characteristics is provided, which comprises two electrodes and a dielectric interposed between the two electrodes, and the dielectric has a two-layer structure comprising a first layer predominantly comprised of niobium oxide NbO x (X = 2.5) and a second layer predominantly comprised of a mixture of niobium oxide NbO x (X = 2. 5) and niobium oxide NbO x (X = 2.0). Preferably, both the first and second layers contain 90 weight % or more of NbO x, and the molar ratio of NbO x ( X= 2. 5) to NbO x ( X= 2. 0) in the second layer is 1: 4 to 4:1, and the proportion of the first layer in the two-layer structure is 0.01 to 10% by volume. One of the electrodes preferably comprises partially nitrided niobium, and more preferably partially nitrided niobium prepared by partialy nitriding a niobium sintered body.

L'invention se rapporte à un condensateur doté d'une grande capacité par unité de masse et de caractéristiques LC préférées. Ce condensateur comporte un matériau diélectrique disposé entre deux électrodes et présentant une structure bicouche comprenant une première couche dont le composant principal est de l'oxyde de niobium, NbOx (x = 2,5), et une seconde couche dont le composant principal est un composé d'oxydes de niobium, NbOx (x = 2,5) et NbOx (x = 2,0). Ces première et seconde couches de matériau diélectrique contiennent chacune 90 % en poids ou plus de NbOx. Le rapport molaire entre NbOx (x = 2,5) et NbOx (x = 2,0) dans la seconde couche est compris entre 1:4 et 4:1. De préférence, la proportion de la première couche dans la structure bicouche est comprise entre 0,01 et 10 % en volume. De préférence, une des électrodes contient en partie du nitrure de niobium, qui est obtenu notamment par transformation azotée du niobium fritté.

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