Effect of Y3+ substitution for Ca on the transport and mechanical properties of Bi2Sr2Ca1−xYxCu2O8+δ system

Investigation of some physical properties of Gd added Bi-2223 superconductors

“…reason for this behavior is explained by Khalil [3] as follows: a) at larger indention loads, the Vickers hardness is found to be small which might be due to the presence of weak grain boundaries of the superconducting ceramics; b) at smaller indention loads, the Vickers hardness is higher which can be ascribed to the fact that measured hardness values were more indicative of the monocrystalline state without interference from grain boundaries. A non-linear hardness versus load behavior has been observed in the literature for Bi-2223 and Bi-2212 [3][4][5][6][7] and for MgB 2 superconductors [8,9], and is known as the indentation size effect (ISE). In order to analyze the ISE behavior and to estimate the true microhardness value, several relationships between the applied load and the resulting indentation size has been suggested [1,[10][11][12].…”

The effect of MgCO3 addition on the superconducting properties of Bi2223 superconductors

“…Since the discovery of BiSrCaCuO(BSCCO) high-T C superconductors [1,2], great progress has been achieved in enhancing transport properties of (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O y (Bi2223) superconductor [3][4][5][6][7][8][9][10][11][12][13]. The BiSrCaCuO(BSCCO) system mainly contains three phases under the general formula Bi 2 Sr 2 Ca n−1 Cu n O 2n+4+ı where n = 1, 2 and 3 refer to the number of CuO 2 layers and incorporate the 20, 85 and 110 K superconducting phases, respectively [14][15][16].…”

“…In this series Bi2223 is most attractive because it has the highest superconductors transition temperature, T C about 110 K. The major limitations of the Bi-system superconductor's application are intergrain weak links and weak flux capability. Chemical doping, substitution, addition and preparation conditions play a very important role in high-T C superconductors [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The objectives of chemical doping are to optimize the hole concentration, to introduce pinning centers, to enhance the formation of Bi2223 phase [17].…”

Experimental and theoretical approaches on mechanical evaluation of Y123 system by Lu addition

“…The curves of the hardness values reach to the plateau region at about 1 N for all the samples studied, meaning that there exists the important change on the microhardness values beyond the certain load value of 1 N. All the results obtained show the presence of the relationship between the applied load and microhardness of the solids. This relationship in the literature is known as Indentation Size Effect (ISE) nature, explaining that the hardness values decrease with the applied loads [25]. In contrast, the microhardness values sometimes increase with the enhancement of the applied load and this behavior is called as Reverse Indentation Size Effect (RISE).…”