Search for High Temperature Superconductors Amongst 312's and the H-Phases

在拟议的项目中，将研究称为O312sO和oh相o的三元化合物的超导特性。材料的公式为M13M2C2，其中M1来自IIIa、IVa、Va或VIa族，M2来自IIIb、IVb或Vb族。典型的成分是Ti3SiC2。PIOs小组制作了致密的单相样品，并研究了它们的原子结构和性质。这些三元化合物与高Tc铜超导体具有三个特性。它们的原子结构呈层状，室温电导率很高，电阻率随温度的降低而降低。由于这些相似之处，这些材料也有可能是超导的。在4.2 ~ 300K的温度范围内，通过四探针直流电阻率、霍尔效应、交流磁化率、磁化强度和场致微波吸收来表征各种312Os和h相的样品。拟议的SGER项目将研究一组不寻常化合物的超导特性，这些化合物有可能成为一类新的高Tc超导体。＊＊＊

9634015 Barsoum In the proposed project, the superconducting characteristics of the ternary compounds known as O312sO and OH-phasesO will be studied. The materials have the formula M13M2C2, where M1 is from groups IIIa, IVa, Va, or VIa, and M2 is from groups IIIb, IVb, or Vb. A typical composition is Ti3SiC2. The PIOs group has fabricated dense, single phase samples and studied their atomic structure and properties. These ternary compounds share three properties with high Tc cuprate superconductors. Their atomic structure is layered, their conductivity at room temperature is very high, and their resistivity decreases with decreasing temperature. Because of these similarities, there is a possibility that these materials might also be superconducting. Samples of a variety of 312Os and H-phases will be characterized at temperatures ranging from 4.2 to 300K by four-probe dc resistivity, Hall effect, ac-susceptibility, magnetization and field-induced microwave absorption. %%% The proposed SGER project will study the superconducting characteristics of a group of unusual compounds, which potentially might be a new class of high Tc superconductors. ***