{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"36a75f3768c5ab3a5fe30e39eabf4bb60d6b876034546705b5a509b26a3b436b","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"836806afad063c1bf1c85d0299c768fe6811708ec81379d33fcb1df2915961b3","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.ferroelectric-polar-textures.polar-nanoregions","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"In relaxors such as lead magnesium niobate, the dipoles never line up into large domains; instead small polar patches, called polar nanoregions, appear and slow down on cooling. What these patches are and why they form is still argued.","posed_since":"","precise":"In Pb(Mg1/3Nb2/3)O3 (PMN) and $\\mathrm{PMN}-x\\mathrm{PbTiO3}$, diffuse scattering and frequency-dispersive dielectric response (Vogel-Fulcher freezing near approximately 220 K in PMN) indicate polar correlations below a Burns temperature of approximately 600 K. Determine their structure (size distribution and correlation length versus $T$; discrete nanoregions versus a continuous slush of nanodomains) and their cause (random electric fields from B-site charge disorder, random bonds, or local strain) with a first-principles-based effective Hamiltonian validated against diffuse-scattering line shapes. An answer is a model reproducing the diffuse scattering and dielectric dispersion.","problem_ref":null,"references":"","settled_by":"An atomistic model whose computed diffuse scattering and dielectric spectra match single-crystal data over 100 to 700 K without fitted correlation parameters.","status_note":"","title":"Structure and origin of polar nanoregions in relaxor ferroelectrics","topic_ref":"39675ee993fdae1601831aaa7eb336e8100565a08d8679ad19287c2eb2abba01"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"cd0df6c694e7c3f008fad29ed7b10263e57b3298f3e4ab486ef8d73a64ee16fa","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e403130e0304652196eca38c598eed2ae516f8c0aa82aea88f656b963fcf0cc0","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"UDbEQR5nxks8rOyA1aAcyzUDKlT_sCeaT0ndvGYGK87g1xbXuAGYesr_sExHthgPqp2jxJsDTrCd9t5M59VXAw"},"schema":"pubphys.envelope/1"},"record_hash":"cd0df6c694e7c3f008fad29ed7b10263e57b3298f3e4ab486ef8d73a64ee16fa","leaf_index":981}