Highly sinterable lanthanum strontium titanate interconnects through doping

摘要

An interconnect material is formed by combining a lanthanum-doped strontium titanate with an aliovalent transition metal to form a precursor composition and sintering the precursor composition to form the interconnect material. The aliovalent transition metal can be an electron-acceptor dopant, such as manganese, cobalt, nickel or iron, or the aliovalent transition metal can be an electron-donor dopant, such as niobium or tungsten. A solid oxide fuel cell, or a strontium titanate varistor, or a strontium titanate capacitor can include the interconnect material that includes a lanthanum-doped strontium titanate that is further doped with an aliovalent transition metal.

主权项

1. A method of forming a solid oxide fuel cell, comprising the steps of:
a) combining a lanthanum-doped strontium titanate (LST) with a compound including Mn or a compound including Nb to form a precursor interconnect composition; b) combining the precursor interconnect composition with a precursor cathode layer of a solid oxide fuel cell; and c) sintering the precursor interconnect composition and the precursor cathode layer to form an interconnect and a cathode, wherein the interconnect is in direct contact with the cathode and has a theoretical density of greater than about 95%, and wherein Mn or Nb is a dopant to replace Ti within the lanthanum-doped strontium titanate and the amount of the compound including Mn or the compound including Nb present in the precursor composition is sufficient to cause the precursor composition to be sintered to the theoretical density of greater than about 95% at a temperature in a range of 1,200° C. to 1,350° C.