Department of Physics

SUPERCONDUCTIVITY RESEARCH LABORATORY
Basic Information

Superconductor samples are prepared by the traditional solid-state method in the “Superconductivity Research Laboratory” of the Faculty of Science, Physics Department. In the solid-state reaction method, the oxide and carbonate compounds forming the superconductor sample are mixed according to their molar ratios in the structure and are grinded for a long time by using agate mortar until a homogeneous mixture is obtained. The high purity (99.99%) oxide and carbonate compounds required for this, Graseby specac press tool (0–15 tons), which ensures that the prepared agat mortar powder material is pelleted under high pressures, and Nabertherm Ash, which provides calcination and sintering of superconductors at high temperatures. The furnace and Protherm tube furnace are located in the Superconductivity Research Laboratory. After the superconducting material preparation process is completed, experimental measurements are carried out to determine the mechanical and magnetic properties of the materials obtained. Magnetic characterization of the materials is carried out with AC susceptibility measurements and mechanical characterization with microhardness measurements.

Ac magnetic susceptibility measurement, which is one of the measurement methods used for magnetic characterization of superconducting materials, is carried out in order to observe the diamagnetic transition for example. AC magnetic susceptibility measurements are made by using the “AC Sensitivity Measurement System” from the project named “Infrastructure Project of Dokuz Eylul University Physics Department Undergraduate Laboratories and Graduate Research Lab” (2010) from DEU Scientific Research Projects Unit. AC Magnetic Sensitivity Measurement System consists of a closed-circuit cooling system (8200 Compressor), cryostat, sample holder coil system, vacuum system, Lock-in Riser (Model SR830 DSP), temperature control system, computer control system. Temperature control between 10-325 K can be achieved with a cooling system using closed-circuit liquid helium. This cooling unit cools with the principle of compressing and expanding helium gas. The temperature control of the system is provided by the Lake Shore 331 Temperature Controller unit. In order for the material to be taken to remain stable at the desired temperatures, heat loss must be prevented. This requires a high level of vacuum. The vacuum in the system is made with the help of the Pfeiffer Vacuum Hi-Cube device.

It enables us to investigate the mechanical properties of the superconductor samples we prepared with the MicroVickers Hardness Testing Machine HM-221 Series from the DEU Scientific Research Projects Unit from the project named “Undergraduate (Physics-II) and Postgraduate Research Laboratory Infrastructure Support Project” (2011). Microhardness Tester is used in researching the mechanical properties of materials such as metal and ceramic. It is suitable for measuring micro and nano-sized hardness. In order to easily interpret the behavior of the material at different depths, loads of 0.4903-19.61 mN can be applied to the materials.

AC MAGNETIC ALINGANITY MEASUREMENT SYSTEM

MICROSERTLIC MEASURING DEVICE (HM-221 Series)

TUBE FURNACE PROTHERM PFT 12/50/450

ASH OVEN PROTHERM PLF 110/10

ASH OVEN NABERTHERM (L3-SH)

Laboratory Officers and Employees

Name Surname: Kemal KOCABAŞ
Position: Manager
Title: Prof. Dr.
Email: kemal.kocabas@deu.edu.tr

Name Surname: Özlem BİLGİLİ
Position: Researcher
Title: Lect. Dr.
E-mail: ozlem.bilgili@deu.edu.tr

Machinery and Equipment

Device name: AC Magnetic Sensitivity Measurement System
Brand / Model: Lock in Amplifier (Model SR830 DSP), Lake Shore 331 Temperature Controller, 8200 Compressor, Pfeiffer Vacuum Hi Cube
Usage Status (Working / Not Working): Working

Device name: Microhardness Meter
Brand / Model: MITUTOYO / MicroVickers Hardness Testing Machine HM-221 Series
Usage Status (Working / Not Working): Working

Projects

Project Name: Y-123 SUPERCONDUCTIVE CERAMICS MAGNETIC, MECHANICAL AND ELECTRICAL
INVESTIGATION OF THE FEATURES
Budget Source: Scientific Research Projects Coordination Unit (BAP)
Project No: 2014.KB.FEN.023
Start-End Date: 08/07 / 2014- 08/07/2016

Project Name: Dokuz Eylül University Physics Department Undergraduate (Physics-II) and Postgraduate Research
Laboratory Infrastructure Support Project
Budget Source: Scientific Research Projects Coordination Unit (BAP)
Project No: 2011.KB.FEN.009
Start-End Date: 04/03 / 2011-04 / 03/2013

Project Name: Dokuz Eylul University Physics Department Undergraduate Laboratories and Graduate Research
Laboratory Infrastructure Project
Budget Source: Scientific Research Projects Coordination Unit (BAP)
Project No: 2010.KB.FEN.001
Start-End Date: 22/01 / 2010-22 / 01/2011

Project Name: Determination of activation energy by DTA method in Bi-2223 Superconductors with doped Sn.
Budget Source: Scientific Research Projects Coordination Unit (BAP)
Project No: 2007.KB.FEN.034
Start-End Date: 20/12 / 2007-20 / 06/2009

Project Name: BIZMUT BASED CERAMIC WITH MAGNETIC ALINGANITY MEASUREMENTS
CHARACTERIZATION OF SUPERCONDUCTORS
Budget Source: Scientific Research Projects Coordination Unit (BAP)
Project No: 2007.KB.FEN.041
Start-End Date: 20/12 / 2007-20 / 12/2009