Microcomposites based on superconducting cuprates

Abstract

Chemical aspects of the formation of microcomposites Chemical aspects of the formation of microcomposites based on superconducting cuprates are considered. The materials based on superconducting cuprates are considered. The materials are composed of a superconducting ceramic matrix and micro-or are composed of a superconducting ceramic matrix and micro-or nanoinclusions of the non-superconducting phase, which are nanoinclusions of the non-superconducting phase, which are uniformly distributed in the matrix. Requirements on the operat-uniformly distributed in the matrix. Requirements on the operating characteristics of the superconducting ceramics are described ing characteristics of the superconducting ceramics are described and routes to high critical current densites are outlined. Phase and routes to high critical current densites are outlined. Phase equilibria in the generic systems are considered. Physical and equilibria in the generic systems are considered. Physical and chemical criteria for the choice of phases that can form non-chemical criteria for the choice of phases that can form nonsuperconducting inclusions are proposed. Methods of prepara-superconducting inclusions are proposed. Methods of preparation and the microstructures and superconducting properties tion and the microstructures and superconducting properties of the composites based on cuprates RBa of the composites based on cuprates RBa 2 2 Cu Cu 3 3 O O 7 77 7d d (R is the (R is the rare-earth element) and on Bi rare-earth element) and on Bi 2 2 Sr Sr 2 2 CaCu CaCu 2 2 O O 8+ 8+d d and and (Bi,Pb) (Bi,Pb) 2 2 Sr Sr 2 2 Ca Ca 2 2 Cu Cu 3 3 O O 10+ 10+d d are considered. The bibliography are considered. The bibliography includes 247 references includes 247 references. .

Analysis of high‐ T c superconductor compounds on the nanometre scale

“…[7] have demonstrated this possibility quite well. Irradiation experiments with a variety of particles (protons, neutrons and heavy ions) also contribute to strengthen the δl-pinning mechanism [15][16][17][18]. As a consequence, a variety of curve shapes are possible [18], depending on the fluence of the radiation.…”

Magnetic Properties and Critical Current of Superconducting Nanocomposites (1 −x)YBa2Cu3O7−δ + xCuO

“…Nowadays, increasing the critical current density in superconductors is achieved by various methods [1]. A large number of studies devoted to this problem were caused by its practical importance.…”

“…The creation of pinning centers in high-temperature superconductors (HTSCs) as well as their thermal and chemical stability has been described in the literature in detail [1][2][3][4]. The most well-known methods for creating structural defects turn out to be the radiation exposure [1], the introduction of various cations into the crystal lattice [2,3], and the introduction of nonsuperconducting particles into the superconductor [1,4]. These methods have two disadvantages: firstly, radiation defects are nondurable; secondly, foreign impurities inside the superconductor often reduce the critical temperature.…”

Influences of Cerium Addition on the Structural and Superconducting Properties with Pb and Pb-free Bi2Sr2Ca2Cu3Oδ System

“…Bi-2223 süperiletken malzemelerin taneler arası kritik akım yoğunluğu değerinin sıcaklık gradyanı, kimyasal bileşim, kristal boyutu, ısıl işlem, presleme basıncı, tanelerin hizalanması vb. birçok faktöre bağlı olduğu iyi bilinmektedir [13,14].…”