Sunday, February 25, 2018

Making YBCO superconductor

How to make and test your own pieces of YBCO superconductor.

Best how-to resources for YBCO:  -- I couldn't get this to work.

All chemical purchased on eBay.

The kiln that I used:

Colored ferrofluid:

Pax temperature logger:

Keithly SMU:

Applied Science on Patreon:


  1. Hi ben, I have been following your content for a long time and I have been using Cryocoolers with a variac. What amperage and voltage are you typically running your cooler at? I have run mine at 15-18volts ac but have no way to monitor it. Thank you very much for posting this! Would it be possible for you to post any specifications as well? Thank you. - Collin W.

  2. Collin, the cryocooler is rated for 140W continuous, but the original drive circuitry in the Superfilter was capable of 155W. My Variac is rated at 10 amps output, so I'd typically run the cryocooler at about 9.5A, which came out to very close to 140W of input power to the Variac. Losses in the Variac are about 5-10W.

  3. Hi Ben, have you tried microwave fabrication?

    These guys made YBaCuO with a modified chemistry. Namely: Y2O3, BaO2 and CuO (so there's extra oxygen) in a 500W domestic microwave oven. I also remember reading a followup paper a while back that used an unmodified microwave (the recipe was something like "cook on power 8 for 7 minutes", lol)


    Edit: here's the followups:


    'High-Tc superconducting samples of YBa2Cu3O7-cursive Greek chi with Tc ∼ 90 K have been prepared in a short time of 25 min, using a domestic microwave oven operated at 2.45 GHz and 200 W, without any post-heat treatment. Post-heat treatment is not necessary due to improvement of the sample environment during the microwave process. That is, a pellet of mixed powders of raw materials is surrounded by mixed powders of raw matetials and subsequenty wrapped in glass wool, in order to suppress rapid dissipation of heat from the surface of the pellet. This leads to successful preparation of homogeneous and oxygenated samples of YBa2Cu3O7-cursive Greek chi.

    Rapid Preparation of YBa 2Cu 3O7-x with T c ˜ 90 K Using a.... Available from: [accessed Apr 21 2018].'