Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

A single solid, easy to use MOD precursor for the growth of ~1┬Ám epitaxial YBCO Superconductor

IP.com Disclosure Number: IPCOM000126707D
Publication Date: 2005-Jul-29
Document File: 2 page(s) / 76K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention describes a method to use a single solid and easy to use MOD precursor for slot-die coating or other suitable deposition process and conversion to epitaxial YBCO superconductor with high performance. The new method is expected to produce a high degree of consistency in the performance and also expected to increase the shelf-life and hence the utilization of the precursor. Additionally, the precursor could serve as a universal precursor for the various coating/printing technologies where the solvent systems are different.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 2

A single solid, easy to use MOD precursor for the growth of ~1µm epitaxial YBCO Superconductor

General Purpose of the Invention

The invention describes a method to use a single solid and easy to use MOD precursor for slot-die coating or other suitable deposition process and conversion to epitaxial YBCO superconductor with high performance. The new method is expected to produce a high degree of consistency in the performance and also expected to increase the shelf-life and hence the utilization of the precursor. Additionally, the precursor could serve as a universal precursor for the various coating/printing technologies where the solvent systems are different.

Prior Art

The current MOD precursor is made in ~100 ml quantities and with pre-qualified solutes such as Y-TFA, Ba-TFA and Cu-TFA in an appropriate solvent. With the qualified salts in hand, making solutes such as of a new batch involves accurate weighing of the 3 individual starting salts, careful transfer of each to a volumetric flask and dissolution of the same in the solvent system. Such a precursor generally has a shelf-life of 2-3 months depending on the humidity conditions. Qualification of the precursor involves ICP, slot die coating and reaction processing. Altogether it involves approximately 15 steps (including the 3 major steps of the qualification). These steps are being done repeatedly every time a new batch is made.

Disadvantages of the Prior Art

Since the method involves several steps, it is prone to errors and may result in batch-to-batch variability in the chemistry (w.r.t to stoichiometry, molar concentration and viscosity) and in batch-to-batch variations in the performance of the final product. Moreover, since such a solution precursor has limited shelf-life, it is not desirable to make them in large volumes. Repeated synthesis necessitates repeated qualification, in addition to all the steps during synthesis. Hence the major disadvantages of the current method are difficulty in synthesis and usage, lack of reproducibility and stability, and delay in getting it qualified for use.

Components, Steps and Operation of the Invention

Concept: It is conceived that if the fundamental chemistry allows, single source sold precursor can be designed, made and stored in large quantities, which requires only one step to synthesis and one for qualification, potentially avoiding almost all the disadvantages of the prior art.

Steps and Operation: Dissolve stoichiometric amounts of qualified starting components (e.g. Y-TFA, Ba-TFA and Cu-TFA) in the solvent system as a single large batch (~...