Heat-transfer phenomena in alloys

Analysis of heat conductivity mechanisms in PbSnTe solid solutions

“…Therefore, one usually operates with one value averaged over branches for both γ and θ. to 40%. Also, according to [43], the intensification of phonon scattering on defects in solid solutions increases the role of N-processes (the author, however, studied the temperature range up to 100 K, and, according to [43], at high T the contribution of N-processes decreases). That is, in the case of highly doped materials or solid solutions, this effect can have a significant impact on the formation of the numerical value of the quantity k. The importance of taking into account N-processes to obtain numerical values of k that agree well with experimental ones is demonstrated in [44] on the example of interpreting the thermal conductivity of Si crystals.…”

“…And this is the basis for neglecting N-processes in most works. But, according to [43], N-processes lead to the redistribution of momentum between phonons, which contributes to the emergence of new phonons (with large k, for example), which will contribute to the activation of U-processes. According to [43], at T < θ, the contribution of N-processes (to thermal conductivity) in BiSb can be up…”

Анализ флуктуационной проводимости в Y-=SUB=-0.5-=/SUB=-Cd-=SUB=-0.5-=/SUB=-Ba-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-

“…С этой точки зрения соединение YBa 2 Cu 3 O 7−δ (YBCO) привлекательно возможностью широкого варьирования состава методом замены иттрия его изоэлектронными аналогами, или изменением степени кислородной нестехиометрии. Отметим, что иттрий в составе YBCO легко замещается большинством лантанидов и другими элементами [1,[21][22][23][24][25][26][27][28][29][30], что обычно не приводит к ухудшению СП свойств исходного состава. Исключение составляет празеодим, т. к. PrBCO -диэлектрик [31,32].…”