“…Some researchers adopted Chen's perspective to explain similar phenomena, though different stabilizers were used. Some of the stabilizers that referred to Chen's work are CeO 2 –TiO 2 , 57 Yb 2 O 3 –Gd 2 O 3 –Y 2 O 3 , 58–60 Ta 2 O 5 , 61,62 Yb 2 O 3 –Y 2 O 3 . 63 Nevertheless, despite the aggressive V 2 O 5 salt, Na 2 SO 4 was also considered to react with YSZ and believed to have a significant contribution to the structure deterioration of YSZ, as described by the following reaction.Na 2 SO 4(l) + V 2 O 5 → 2NaVO 3(l) + SO 3(g) 2NaVO 3(l) + (t-ZrO 2 )ZrO 2 Y 2 O 3 → 2YVO 4 + Na 2 O + ZrO 2 (m-ZrO 2 )…”