Enhanced Pyroelectric Properties and Thermal Stability of [001]‐oriented Mn‐doped PMN‐0.37PT Tetragonal Crystals
Xinyue Pang, Yanxue Tang, Feifei Wang, Xiangyong Zhao, Tao Wang, Zhihua Duan, Anyang Cui, Zhongchen Gao, Di Lin, Jie JiaoABSTRACT
To develop high‐performance materials for infrared detection and energy harvesting applications, the pyroelectric properties and thermal stability of [001]‐oriented 0.5 mol% Mn‐doped 0.63Pb(Mg 1/3 Nb 2/3 )O 3 ‐0.37PbTiO 3 tetragonal single crystals were investigated. At room temperature, the crystals exhibit a high pyroelectric coefficient ( p ) of 7.9 × 10 −4 C m −2 K −1 , suppressed dielectric permittivity ( ε r ) of 578, and dielectric loss (tan δ ) of 0.0013, which is reduced by approximately 68% at 100 Hz by Mn‐doping. Furthermore, the values of ε r and tan δ remain low for thermal treatment temperatures below 90°C, indicating only slight depolarization in crystals. The high p and suppression of dielectric properties lead to high figures of merit for current responsivity F i = 3.2 × 10 −10 m V −1 , voltage responsivity F v = 0.06 m 2 C −1 , detectivity F d = 12.3 × 10 −5 Pa −1/2 , and energy harvesting F E = 122.0 × 10 −11 J m −3 K −2 at 100 Hz. As the temperature increases to 90°C, the values of F i , F v , F d , and F E remain 111%, 84%, 70%, and 94% of their room‐temperature values, respectively, due to its high Curie temperature of 172°C. The high pyroelectric properties and superior thermal stability make the crystals promising for high‐performance and wide‐operational‐temperature infrared detectors and energy harvesters.