It can be seen that the ZT of all composite samples is similar: ZT gradually increases with increasing temperature, and ZT gradually decreases with increasing temperature after reaching the maximum value.
As you can see, the ZT sits similarly for all composite samples: as the temperature increases, the ZT decreases gradually as the temperature increases.
It can be seen that the ZT of all composite samples are similar: with the increase of temperature, ZT increases gradually, and when it reaches the maximum value, ZT decreases gradually with the increase of temperature.