{"cited_by_count":253941,"description":"This cluster of papers focuses on the phenomenon of negative thermal expansion in various materials, including perovskites, framework compounds, and antiperovskite compounds. It explores the mechanisms, controllability, and technological applications of negative thermal expansion, as well as its correlation with superconductivity and magnetic properties. Additionally, it discusses the development of sodium-beta alumina batteries and the associated challenges and perspectives.","display_name":"Thermal Expansion and Ionic Conductivity","domain_id":"3","external_ids":{"openalex":"https://openalex.org/T12875","wikipedia":"https://en.wikipedia.org/wiki/Negative_thermal_expansion"},"field_id":"25","id":"T12875","keywords":[{"display_name":"negative thermal expansion","id":"negative-thermal-expansion","score":0.5337,"url":"https://openalex.org/keywords/negative-thermal-expansion"},{"display_name":"beta-alumina","id":"beta-alumina","score":0.5629,"url":"https://openalex.org/keywords/beta-alumina"},{"display_name":"anisotropic thermal expansion","id":"anisotropic-thermal-expansion","score":0.2302,"url":"https://openalex.org/keywords/anisotropic-thermal-expansion"},{"display_name":"sodium beta-alumina","id":"sodium-beta-alumina","score":0.7208,"url":"https://openalex.org/keywords/sodium-beta-alumina"},{"display_name":"ZrW2O8","id":"zrw2o8","score":0.4811,"url":"https://openalex.org/keywords/zrw2o8"},{"display_name":"zero thermal expansion","id":"zero-thermal-expansion","score":0.5061,"url":"https://openalex.org/keywords/zero-thermal-expansion"},{"display_name":"anomalous thermal expansion","id":"thermal-expansion-anomaly","score":0.2604,"url":"https://openalex.org/keywords/thermal-expansion-anomaly"},{"display_name":"low-temperature expansion","id":"low-temperature-thermal-expansion","score":0.2246,"url":"https://openalex.org/keywords/low-temperature-thermal-expansion"},{"display_name":"antiperovskite","id":"antiperovskite","score":0.2585,"url":"https://openalex.org/keywords/antiperovskite"},{"display_name":"lattice thermal expansion","id":"lattice-thermal-expansion","score":0.2693,"url":"https://openalex.org/keywords/lattice-thermal-expansion"},{"display_name":"near-zero thermal expansion","id":"near-zero-thermal-expansion","score":0.5704,"url":"https://openalex.org/keywords/near-zero-thermal-expansion"},{"display_name":"positive thermal expansion","id":"positive-thermal-expansion","score":0.5392,"url":"https://openalex.org/keywords/positive-thermal-expansion"},{"display_name":"rigid unit modes","id":"rigid-unit-modes","score":0.3627,"url":"https://openalex.org/keywords/rigid-unit-modes"},{"display_name":"isotropic thermal expansion","id":"isotropic-thermal-expansion","score":0.6776,"url":"https://openalex.org/keywords/isotropic-thermal-expansion"},{"display_name":"negative thermal expansion coefficient","id":"negative-thermal-expansion-coefficient","score":0.2459,"url":"https://openalex.org/keywords/negative-thermal-expansion-coefficient"},{"display_name":"Na-\u03b2''-alumina","id":"na-beta-alumina","score":0.5458,"url":"https://openalex.org/keywords/na-beta-alumina"},{"display_name":"\u03b2-eucryptite","id":"beta-eucryptite","score":0.2001,"url":"https://openalex.org/keywords/beta-eucryptite"},{"display_name":"beta-alumina electrolyte","id":"beta-alumina-electrolyte","score":0.4557,"url":"https://openalex.org/keywords/beta-alumina-electrolyte"},{"display_name":"conduction planes","id":"conduction-planes","score":0.6282,"url":"https://openalex.org/keywords/conduction-planes"},{"display_name":"thermal expansion control","id":"thermal-expansion-control","score":0.3065,"url":"https://openalex.org/keywords/thermal-expansion-control"},{"display_name":"ScF3","id":"scf3","score":0.4053,"url":"https://openalex.org/keywords/scf3"},{"display_name":"zirconium tungsten oxide","id":"zirconium-tungsten-oxide","score":0.4351,"url":"https://openalex.org/keywords/zirconium-tungsten-oxide"},{"display_name":"sodium-sulfur cells","id":"sodium-sulfur-cells","score":0.3849,"url":"https://openalex.org/keywords/sodium-sulfur-cells"},{"display_name":"spinel block","id":"spinel-block","score":0.4518,"url":"https://openalex.org/keywords/spinel-block"},{"display_name":"ZrV2O7","id":"zrv2o7","score":0.3888,"url":"https://openalex.org/keywords/zrv2o7"}],"legacy_keywords":["Negative Thermal Expansion","Materials","Perovskite","Framework","Superconductivity","Magnetic Nanocrystals","Lattice Dynamics","Antiperovskite Compounds","Anomalous Physical Properties","Sodium-Beta Alumina Batteries"],"openalex_id":"https://openalex.org/T12875","source_created_date":"2024-01-23T15:27:16","source_updated_date":"2026-10-17T03:02:00","subfield_id":"2505","url":"/topics/T12875","works_api_url":"https://api.openalex.org/works?filter=topics.id:T12875","works_count":19611,"label":"Thermal Expansion and Ionic Conductivity","provider":"openalex","revision":"4c4cef9d110fb365","taxonomy_revision":"f050b5d4780b1289","title":"Thermal Expansion and Ionic Conductivity","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"38351533787766943","address_version":"morton4x16-v1","coordinates":[3,25,2505,12875],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}