{"id":"https://openalex.org/keywords/ptcr-effect","display_name":"PTCR effect","description":"A sharp increase in electrical resistivity as temperature rises, characteristic of certain ferroelectric semiconducting ceramics.","display_name_alternatives":["positive temperature coefficient of resistivity effect","positive temperature coefficient of resistance effect"],"ids":{"openalex":"https://openalex.org/keywords/ptcr-effect","wikidata":null},"primary_topic":{"id":"https://openalex.org/T13251","display_name":"Electrical and Thermal Properties of Materials","score":0.7396,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T13251","display_name":"Electrical and Thermal Properties of Materials","score":0.7396,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10107","display_name":"Ferroelectric and Piezoelectric Materials","score":0.1297,"subfield":{"id":"https://openalex.org/subfields/2505","display_name":"Materials Chemistry"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T13249","display_name":"Dielectric properties of ceramics","score":0.076,"subfield":{"id":"https://openalex.org/subfields/2505","display_name":"Materials Chemistry"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"works_count":185,"cited_by_count":2181,"works_api_url":"https://api.openalex.org/works?filter=keywords.id:keywords/ptcr-effect","updated_date":"2026-10-14T04:06:44","created_date":"2026-09-30T00:00:00"}
