Hydrolytic and deliquescent properties of superconducting YBaCu oxide

Aging Effects and Passivation Studies on Undoped and Ag‐Doped YBa2Cu3 O 7 − x Laser Ablated Thin Films

“…1 are the normalized resistance vs. temperature plots of undoped YBCO on MgO and undoped and Ag-doped YBCO films on SrTiQ dipped in hot water a t . It has also been observed that the films degradation is further accelerated if water temperature is raised above 50~ This observation is in conformity with the results of Dexin et al 27 who have shown that when YBCO pellets are immersed in water, the pellets degrade and elevated temperature accelerates this degradation. Two inferences can be made from Fig.…”

“…The Ag-doped films on SrTiO3 showed the maximum resistance to degradation. It has also been observed that the films degradation is further accelerated if water temperature is raised above 50~ This observation is in conformity with the results of Dexin et al 27 who have shown that when YBCO pellets are immersed in water, the pellets degrade and elevated temperature accelerates this degradation.…”

Cold sintering of YBa2Cu3O7−δ

“…1) for cold sintering of YBCO: the addition of water, followed by grinding, causes the breakdown of some of the starting powder particles into smaller particles surrounded by an amorphous layer composed of the three metal ions. This is attributed to the cracking process known to occur when YBCO is exposed to water, 19,20 the results of which can be observed in the SEM images in Fig. 1.…”

“… 19 When exposed to moisture, YBCO has been shown to decompose into BaCO 3 , CuO and Y(OH) 3 . 20 Interestingly, although insoluble in water, bulk YBCO samples have been shown to form an amorphous surface layer in the presence of water, similar to that in as is observed during cold sintering of soluble materials. 21 This layer may well facilitate the cold sintering process in YBCO at greatly reduced temperatures compared to solid state sintering.…”