{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"bda4829fdd2f65636ac03cd22f4947c5e665413c9061cceeba7eff8e9777519e","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["cd0df6c694e7c3f008fad29ed7b10263e57b3298f3e4ab486ef8d73a64ee16fa","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"b817e0813f49a6bf617c72d0df9e397588f396b5809eb9da50dfcd0c297af77a","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":"2","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)$\\mathrm{O_3}$ (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":"cd0df6c694e7c3f008fad29ed7b10263e57b3298f3e4ab486ef8d73a64ee16fa","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"73d98e9abca3127cab48ba65f95e5a28286068999823b24a105b5dbd6fab45be","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"aa84b255194f8820312b409a58d316f4e4eb920a23314bb481f60246b3c902bd","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"FYQrhK3uNSVCmR65YE2SzWiR7mv3tmYF4xZ2JCkn47zQYqwo5Y_0UQl6z805gdL7oKasNJXwslFN-fDhg9msDg"},"schema":"pubphys.envelope/1"},"record_hash":"73d98e9abca3127cab48ba65f95e5a28286068999823b24a105b5dbd6fab45be","leaf_index":2790}