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Anion\u2010ordered Janus structures hold potential for developing large spontaneous polarization ferroelectrics. However, van der Waals disordered alloys are generally more thermodynamically stable; anion\u2010ordered Janus structures can only be realized in certain monolayer transition metal dichalcogenides so far. The polarization in these materials cannot be reversed; therefore, the realization of anion order triggered ferroelectricity remains a challenge. Here, we report that S\/Se ordering induces Janus ferroelectricity in SnS\n                    <jats:sub>0.6<\/jats:sub>\n                    Se\n                    <jats:sub>0.4<\/jats:sub>\n                    nanobelts with a high Curie temperature of approximately 600 K. The second\u2010harmonic generation of SnS\n                    <jats:sub>0.6<\/jats:sub>\n                    Se\n                    <jats:sub>0.4<\/jats:sub>\n                    nanobelts is approximately 300 times more intense than that of SnS nanobelts. The switchable spontaneous polarization of SnS\n                    <jats:sub>0.6<\/jats:sub>\n                    Se\n                    <jats:sub>0.4<\/jats:sub>\n                    nanobelts was confirmed by piezoelectric force microscopy, representing the first realization of anion\u2010ordered Janus ferroelectricity. This anion ordering induces a structural phase transition from the non\u2010ferroelectric Pnma to the ferroelectric phase Pm. Our work has realized a periodically anion\u2010ordered Janus structure with ferroelectricity in van der Waals materials and provided a candidate material for novel non\u2010volatile memory devices and optoelectronic applications.\n                  <\/jats:p>","DOI":"10.1002\/adma.202522734","type":"journal-article","created":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T07:47:57Z","timestamp":1776152877000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Anion Order Triggered Janus Ferroelectricity in Chalcogenides"],"prefix":"10.1002","volume":"38","author":[{"given":"Zhiguo","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Solid State Chemistry Department of Physical Chemistry University of Science and Technology Beijing  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiang","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of 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