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Microstructure and Magnetic Properties of La-Ca-Sr-Mn-O Perovskite Ceramics

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Zmorayova K., Antal V., Radusovska M., Piovarci S., Kováč J., Kavecansky V., Diko P.

Acta Physica Polonica A

2014

vol. 126

issue 1

168-169

La_{0.67}Ca_{0.33-x}Sr_{x}MnO_{3} (x=0.33; 0.03; 0) (LCSM) perovskite magnetocaloric ceramics were prepared by solid state synthesis in air and sintering at 1520°. The phase composition was checked by x-ray powder diffraction. Microstructure analyses were done by scanning electron microscopy. The influence of high pressure oxygenation on magnetisation behaviour is shown.

Microstructure and Properties of Y-123/Y-211 Bulk Superconductors with BaCeO_{3} and BaO_{2} Addition

100%

Zmorayova K., Antal V., Radusovska M., Piovarci S., Volochova D., Diko P.

Acta Physica Polonica A

2014

vol. 126

issue 1

366-367

YBa_{2}Cu_{3}O_{7-δ} (YBCO) bulk single-grain superconductors were prepared by a TSMG process. CeO_{2}, BaCeO_{3} and BaO_{2} powders were added to nominal composition Y_{1.5}Ba_{2}Cu_{3}O_{7} with the aim to refine Y_{2}BaCuO_{5} (Y-211) secondary particles. Added powders were refined by milling in a friction milling and characterized by X-ray powder difractometry. Thermal properties of the systems were characterized by DTA. Microstructure of samples was studied by PLM. Successful refinement of Y-211 particles size was confirmed by IP measurements. Transition temperatures and field dependences of the magnetic moment for further determination of the critical current densities were obtained using a VSM.

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2 Acta Physica Polonica A

2 2014

2 Antal V.

2 Diko P.

2 Piovarci S.

2 Radusovska M.

2 Zmorayova K.

1 Kavecansky V.

1 Kováč J.

1 Volochova D.

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Microstructure and Magnetic Properties of La-Ca-Sr-Mn-O Perovskite Ceramics

Microstructure and Properties of Y-123/Y-211 Bulk Superconductors with BaCeO_{3} and BaO_{2} Addition