{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T01:09:22Z","timestamp":1767920962653,"version":"3.49.0"},"reference-count":17,"publisher":"AIP Publishing","issue":"12","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2003,3,24]]},"abstract":"<jats:p>We studied the dc conductivity of low-density polyethylene in the temperature range from 20 to 90\u200a\u00b0C for electric fields from 4 kV\u200am\u22121 to 20 MV\u200am\u22121. The isochronal data measured after 1 h are in agreement with the literature. For a long time (6 days), the conduction mechanism is dominated by the space charge trapped in the material. The current does not attain a steady-state value after 29 days at 50\u200a\u00b0C and 8 MV\u200am\u22121. It oscillates continuously, the variations are less regular and the conductivity decreases significantly as the sample thickness increases. The activation energy decreases from 0.8 to 0.58 eV when determined from long time measurements. An explanation is proposed considering the constraints imposed by the trapped space charge on charge injection and transport. We propose to call the observed mechanism space-charge-controlled conductivity.<\/jats:p>","DOI":"10.1063\/1.1559656","type":"journal-article","created":{"date-parts":[[2003,3,20]],"date-time":"2003-03-20T23:17:58Z","timestamp":1048202278000},"page":"1920-1922","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":22,"title":["Space-charge-controlled conductivity in low-density polyethylene"],"prefix":"10.1063","volume":"82","author":[{"given":"Eugen R.","family":"Neagu","sequence":"first","affiliation":[{"name":"Departamento de Ciencias dos Materiais (CENIMAT), Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, 2829-516\u2009Caparica, Portugal"}]},{"given":"Jose N.","family":"Marat-Mendes","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias dos Materiais (CENIMAT), Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, 2829-516\u2009Caparica, Portugal"}]}],"member":"317","reference":[{"key":"2024020400094318100_r1"},{"key":"2024020400094318100_r2","doi-asserted-by":"crossref","first-page":"503","DOI":"10.1109\/94.868069","volume":"7","year":"2000","journal-title":"IEEE Trans. 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