Danijel Djurek: Room Temperature Superconductor (German
Patent # 10007915)

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**Danijel DJUREK**

**Room Temperature Superconductor**

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**[http://newscientist.com/daily
news.jsp?id=ns9999562](http://newscientist.com/daily%20news.jsp?id=ns9999562)**

**A New Superconductor said to have Zero
Electrical Resistance at Room Temperature is Revealed
but Scepticism Remains**

A new
superconductor said to have zero electrical resistance at
room temperature is revealed but scepticism remains

Superconductivity
is creating a buzz again with the announcement of a new
material that is said to have zero electrical resistance at
room temperature.

The claim, from
researchers in Croatia, comes just a few weeks after the
discovery that the simple chemical magnesium diboride
superconducts at temperatures up to almost twice those
needed for other metallic superconductors to work

The Croatian
scientists say that current will flow effortlessly through
their material, a mixture of lead carbonate and lead and
silver oxides, at up to about 30  degC.

"These results are
suggestive of a transition to a superconducting state," says
Georg Bednorz of the IBM Zurich Research Laboratory, who
shared the 1987 Nobel physics prize for discovering cuprate
superconductors.

But because of
numerous false alarms in this field, researchers are
treating the announcement with caution, especially as no one
has yet managed to reproduce the results.

**Magic formula**

Danijel Djurek, a
physicist at A. Volta Applied Ceramics in Zagreb, Croatia,
claims that he discovered his superconducting ceramic
mixture in the late 1980s. But he was unable to pin down the
structure and formula of the material, and his research was
interrupted by years of war, following Croatia's split from
Yugoslavia. Now Djurek and his team say they have finally
hit on a formula that works reliably and reproducibly at
room temperature.

Some telltale signs
of superconductivity are easy to spot. For example, a graph
of resistance plotted against temperature shows a
characteristic drop at the temperature at which the material
becomes superconducting. Physicists usually require other
evidence too, such as the ability to expel all magnetic
fields. Djurek's material seems to do this too.

Archie Campbell,
director of Cambridge University's Interdisciplinary
Research Centre in Superconductivity, says the data clearly
shows the hallmark of a superconductor. "This is not a small
effect. There's no room for misinterpretation," he says,
adding it's either superconductivity or it's a mistake.

Nevertheless, all
the researchers contacted by New Scientist were extremely
reluctant to start popping corks. "I have some concerns
which keep my enthusiasm on a moderate level," says Bednorz.

**Do it again**

The biggest
question mark hangs over the failure of other groups to
replicate the results. Paul Chu, director of the Texas
Center for Superconductivity at the University of Houston,
has been following Djurek's work for some time.

"We recently tried
to use his new formula but failed to reproduce his results,"
says Chu. "I think we will try a little more. It's too
important to ignore."

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**German Patent # 10007915**

**Material used, e.g., in the Production
of a Sputtering Target and as a Superconductor
contains Lead, Carbon and Oxygen**

**Danijel Djurek. et al.**

Patent number: DE10007915   
Publication date: 2001-09-13   
Inventor: DJUREK DANIJEL (HR); MEDUNIC ZVONKO (HR); PALJEVIC
MATIJA (HR); TONEJC ANTON (HR)   
Applicant: ALCATEL HIGH TEMPERATURE SUPER (DE)   
Classification: --- International: C22C11/00; C22C32/00;
H01L39/12; C22C11/00; C22C32/00; H01L39/12; (IPC1-7):
H01B12/00; C22C5/06; C22C11/00; G01R33/035; H01B1/02;
H01B12/10; H01F6/00; H01F27/28; H02K3/02; ---- European:
C22C11/00; C22C32/00; H01L39/12C   
Application number: DE20001007915 20000221   
Priority number(s): DE20001007915 20000221

**Abstract:** Material contains
at least 5 wt.% lead, at least 0.1 wt.% carbon and at least 1
wt.% oxygen and has a specific electrical resistance of not
more than 0.5 x 10<-6> Ohm .cm at approximately -79 deg
C and/or not more than 1 x 10<-6> Ohm .cm at
approximately +20 deg C. Preferred Features: The material
further contains Ca, Sr, Ba, Bi, Sb, Hg and Tl.

**[ [DE10007915](de10007915.pdf)
] ( PDF )**

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