1H1T

1H1T is an alphanumeric designation used in several contexts, most notably in materials science to describe the phase composition of certain transition metal dichalcogenides (TMDCs). In this setting, 1H and 1T refer to two distinct crystal structures that can occur in compounds like MoS2 and WS2: the 1H phase is trigonal prismatic (hexagonal) and semiconducting, while the 1T phase is octahedral (tetragonal) and metallic. The label 1H1T is used to denote a sample that contains both phases, either as a mixed polytype or as a transitional/metastable state produced by intercalation, chemical treatment, or thermal processing.

Characterization of 1H1T materials relies on techniques such as Raman spectroscopy, X-ray diffraction, scanning transmission electron microscopy, and electrical measurements to determine phase fractions and spatial distribution. The presence and ratio of 1H and 1T phases strongly influence properties including electrical conductivity, catalytic activity, and optical response, making phase engineering a common research objective in TMDC research.

Outside materials science, 1H1T may appear as an alphanumeric code or catalog identifier in other domains. Its meaning is context-specific and requires accompanying documentation to interpret accurately.