Novel pyroelectric single crystals PIN-PMN-PT and their applications for NDIR gas detectors

Abstract Ternary manganese-doped (1− x − y )Pb(In 1/2 Nb 1/2 )O 3 - x Pb(Mg 1/3 Nb 2/3 )O 3 - y PbTiO 3 (Mn-doped PIN-PMN-PT) single crystals have demonstrated remarkable pyroelectric properties alongside enhanced temperature stability. These attributes hold substantial promise for the advancement of high precision nondispersive IR (NDIR) applications. In this study, Mn-doped 0.21Pb(In 1/2 Nb 1/2 )O 3 -0.49Pb(Mg 1/3 Nb 2/3 )O 3 -0.30PbTiO 3 single crystals were introduced and carefully investigated. A compensated structure of pyroelectric IR detector based on Mn-doped PIN-PMN-PT single crystal was designed and fabricated, and a CO 2 gas concentration monitoring module was built. Results showed that Mn-doped PIN-PMN-PT single crystals exhibit high pyroelectric coefficient, and better thermal stability than binary (1− x )Pb(Mg 1/3 Nb 2/3 )O 3 - x PbTiO 3 system. The compensated pyroelectric IR detectors using Mn-doped PIN-PMN-PT single crystals as element chips showcase a performance that is approximately fourfold higher than that of commercial LiTaO 3 pyroelectric detectors. The NDIR CO 2 gas sensor module was assembled and exhibited remarkable accuracy along with an impressively low minimum detection concentration. These outcomes underscores its substantial potential for practical utilization in gas monitoring applications.