Malaysian
Journal of Analytical Sciences Vol 24 No 5
(2020): 766 - 771
EFFECT OF Cr2O3 ON THE TRANSITION TEMPERATURE
AND PHASE FORMATION OF Tl2-xCrxBa2CaCu2O8-δ
SUPERCONDUCTOR
(Kesan Cr2O3 Terhadap Suhu Peralihan dan
Pembentukan Fasa Superkonduktor
Tl2-xCrxBa2CaCu2O8-δ)
Syahrul Humaidi1* and Roslan Abd-Shukor2
1Department of Physics,
FMIPA-Universitas Sumatera Utara, Jln
Bioteknologi 1, Medan 20155, Indonesia
2Department of Applied
Physics,
Universiti Kebangsaan Malaysia, 43600 UKM
Bangi, Selangor, Malaysia
*Corresponding author: syahrul1@usu.ac.id
Received: 13 November 2019;
Accepted: 3 September 2020; Published: 12 October 2020
Abstract
The Tl-based high Tc superconductors, Tl2-xCrxBa2CaCu2O8-δ
(Tl2212) have been prepared via the solid-state reaction method. The
substitution of Cr into the Tl-site was aimed to investigate the role of Cr on
the transition temperature and phase stability of the Tl2212 phase. Ba2CaCu2Oy
precursor material was synthesized using BaCO3 (99.9%, Aldrich), CaO
(99.99%, Alfa Aesar), and CuO (99.9%, Alfa Aesar) powder as the starting
compound. The powders were mixed and sintered at 900 oC for 24 hours
before cooled to room temperature. The precursor was mixed with Tl2O3
(99.9%, Alfa Aesar) and Cr2O3 (99.9%, Merck) powders
before being pressed to obtain Tl2-xCrxBa2CaCu2O8
pellet. The pellets were heated at 900 oC with oxygen flow for
4 minutes. The transition temperature, Tc
was determined using the standard four-point probe electrical resistance
measurements from 50 K to 300 K with a constant current of 20 mA. The phases
were determined by powder X-ray diffraction (XRD) method using CuKα
source with λ= 1.5418 Å. Based on XRD analysis, the x = 0, 0.2, and 0.6 showed unit cell belonging to the 14/mmm space
group. In the x = 0.4, the space
group changed to P4/mmm which is the Tl1212 phase. It was found that the
optimum composition was Tl1.8Cr0.2Ba2CaCu2O8-δ
and the maximum zero-resistance temperature, Tc-zero was 96 K, and the onset temperature, Tc-onset was 116 K. It was
observed that the transition temperatures decreased with increasing Cr2O3.
The volume fraction of the Tl2212 phase in this composition was 88% with the c-lattice parameter equals to 29.388Å.
Superconductivity was destroyed in the x
= 1.0 samples.
Keywords: transition temperature, structure, Tl2212
phase
Abstrak
Superkonduktor suhu tinggi berasaskan Tl iaitu, Tl2-xCrxBa2CaCu2O8-δ
(Tl2212) telah
disediakan melalui kaedah tindak balas pepejal. Penggantian Cr pada
kedudukan Tl dilakukan untuk menyelidik peranan Cr terhadap suhu genting dan
kestabilan fasa superkonduktor Tl2212. Bahan pelopor Ba2CaCu2Oy disintesis dengan
menggunakan serbuk BaCO3(99.9%, Aldrich), CaO(99.99%, Alfa Aesar)
dan CuO(99.9%, Alfa Aesar) sebagai campuran awal. Serbuk ini kemudiannya
disinter pada 900 oC selama 24 jam dan dibiarkan sejuk sehingga suhu
bilik. Bahan pelopor ini kemudianmya dicampurkan dengan serbuk Tl2O3 (99.9%, Alfa Aesar) dan
serbuk Cr2O3(99.9%, Merck) untuk menghasilkan pelet Tl2-xCrxBa2CaCu2O8.
Pelet kemudiannya disinter pada 900 oC dengan aliran gas oksigen selama 4
minit. Suhu peralihan, Tc
ditentukan dengan
pengukuran rintangan elektrik menggunakan kaedah piawai empat titik dalam suhu 50 K hingga 300K dengan bekalan arus malar 20
mA. Pecahan fasa diperolehi daripada kaedah pembelauan serbuk sinar-X (XRD) menggunakan sinar CuKα
dengan panjang
gelombang λ= 1.5418Å. Berdasarkan analisis XRD, sampel x = 0, 0,2, dan 0.6 adalah pada kumpulan
ruang 14/mmm. Untuk sampel x = 0.4
kumpulan ruang berubah menjadi P4/mmm iaitu fasa yang berlainan (Tl1212).
Didapati bahawa suhu peralihan sifar maksimum, Tc sifar adalah 96 K dan suhu perlalihan mula, Tc mula adalah 116 K bagi
komposisi Tl1.8Cr0.2Ba2CaCu2O8-δ. Pecahan isipadu
daripada fasa Tl2212 dalam sampel ini adalah 88% dengan parameter kekisi
c bersamaan 29.388 Å. Sifat
superkonduktor hilang pada komposisi x
= 1.0.
Kata
kunci: suhu peralihan, struktur, fasa Tl2212
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