{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25625"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25625","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effect of pressure on ionic conductivity in rubidium silver iodide and silver iodide","abstract":"The effect of pressure on the ionic conductivity of RbAg4I5 and AgI has been measured, using single crystals and polycrystalline samples, up to pressures of 6 kbar. The activation volumes for motion in cr-RbAg4I5 and B-RbAgI5, respectively, are -0.4 ±.2 cm3/mole and -0.2 ±.l cm3/mole. In 4a-AgI, the motion volume increases from 0.56 ±.l cm3 /mole at 435 K to 0.8 ±.l cm3/mole at 623 K. These values are unusually small in relation to the activation energies and are not consistent with the strain energy model or a domain diffusion mechanism. The negative activation volume for super-ionic RbAgIand the small size of the activation volume for cr-AgI may be 4S the result of pressure increasing the interaction enthalpy between the diffusing ions. The logarithms of the ionic conductivities of cr-and B-RbAgIin4S crease linearly at first and then decrease quadratically with pressure. This is related to the large quadratic pressure dependence of the second-order transition temperature, 6T (K) = 0.14lP (kbar) + 0.111p2 (kbar2). c The variation of the 122 K transition temperature with pressure is 6T(K) = S.6SP (kbar) -0.S3P2 (kbar2), implying a molar volume change of c VB -Vy = 0.37 ±.Ol cm3 /mole and a change in compressibility KB -Ky = 0.033 ±.OOI x 10-11 cm2/dyne, across the transition. The ionic conductivity of y-RbAg Iinitially decreases with an 4S activation volume of 9 ±l cm3/mole, and then levels off with increasing pressure. This may be the result of an extrinsic-like region or of grain-boundary conduction. The negative activation volume for conduction along the c-axis in B-AgI has been confirmed. Both low-temperature phases have large formation volumes consistent with the theory of Rice et al. of transitions to the superionic phase.","abstract_html":"The effect of pressure on the ionic conductivity of RbAg4I5 and AgI has been measured, using single crystals and polycrystalline samples, up to pressures of 6 kbar. The activation volumes for motion in cr-RbAg4I5 and B-RbAgI5, respectively, are -0.4 ±.2 cm3/mole and -0.2 ±.l cm3/mole. In 4a-AgI, the motion volume increases from 0.56 ±.l cm3 /mole at 435 K to 0.8 ±.l cm3/mole at 623 K. These values are unusually small in relation to the activation energies and are not consistent with the strain energy model or a domain diffusion mechanism. The negative activation volume for super-ionic RbAgIand the small size of the activation volume for cr-AgI may be 4S the result of pressure increasing the interaction enthalpy between the diffusing ions. The logarithms of the ionic conductivities of cr-and B-RbAgIin4S crease linearly at first and then decrease quadratically with pressure. This is related to the large quadratic pressure dependence of the second-order transition temperature, 6T (K) = 0.14lP (kbar) + 0.111p2 (kbar2). c The variation of the 122 K transition temperature with pressure is 6T(K) = S.6SP (kbar) -0.S3P2 (kbar2), implying a molar volume change of c VB -Vy = 0.37 ±.Ol cm3 /mole and a change in compressibility KB -Ky = 0.033 ±.OOI x 10-11 cm2/dyne, across the transition. The ionic conductivity of y-RbAg Iinitially decreases with an 4S activation volume of 9 ±l cm3/mole, and then levels off with increasing pressure. This may be the result of an extrinsic-like region or of grain-boundary conduction. The negative activation volume for conduction along the c-axis in B-AgI has been confirmed. Both low-temperature phases have large formation volumes consistent with the theory of Rice et al. of transitions to the superionic phase.","abstract_has_math":false,"creators":["Allen, Paul Clement"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Lazarus, David"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-07-01T17:55:09Z","date_published":"2011-07-01T17:55:09Z","updated_at":"2026-07-22T22:25:24Z","subjects":["ionic conductivity","rubidium silver iodide","silver iodide","single crystals","polycrystalline"],"languages":["en"],"rights":["1977 Paul Clement Allen"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["252664"],"render_values":[{"text":"252664","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25625","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lazarus, David"]},{"key":"dc:creator","label":"Author","values":["Allen, Paul Clement"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-01T17:55:09Z","10000-01-01","1977"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["ionic conductivity","rubidium silver iodide","silver iodide","single crystals","polycrystalline"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1977 Paul Clement Allen"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["252664","http://hdl.handle.net/2142/25625"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The effect of pressure on the ionic conductivity of RbAg4I5 and AgI has been measured, using single crystals and polycrystalline samples, up to pressures of 6 kbar. The activation volumes for motion in cr-RbAg4I5 and B-RbAgI5, respectively, are -0.4 ±.2 cm3/mole and -0.2 ±.l cm3/mole. In 4a-AgI, the motion volume increases from 0.56 ±.l cm3 /mole at 435 K to 0.8 ±.l cm3/mole at 623 K. These values are unusually small in relation to the activation energies and are not consistent with the strain energy model or a domain diffusion mechanism. The negative activation volume for super-ionic RbAgIand the small size of the activation volume for cr-AgI may be 4S the result of pressure increasing the interaction enthalpy between the diffusing ions. The logarithms of the ionic conductivities of cr-and B-RbAgIin4S crease linearly at first and then decrease quadratically with pressure. This is related to the large quadratic pressure dependence of the second-order transition temperature, 6T (K) = 0.14lP (kbar) + 0.111p2 (kbar2). c The variation of the 122 K transition temperature with pressure is 6T(K) = S.6SP (kbar) -0.S3P2 (kbar2), implying a molar volume change of c VB -Vy = 0.37 ±.Ol cm3 /mole and a change in compressibility KB -Ky = 0.033 ±.OOI x 10-11 cm2/dyne, across the transition. The ionic conductivity of y-RbAg Iinitially decreases with an 4S activation volume of 9 ±l cm3/mole, and then levels off with increasing pressure. This may be the result of an extrinsic-like region or of grain-boundary conduction. The negative activation volume for conduction along the c-axis in B-AgI has been confirmed. Both low-temperature phases have large formation volumes consistent with the theory of Rice et al. of transitions to the superionic phase.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-01T17:55:09Z No. of bitstreams: 1 1977_allen.pdf: 2559598 bytes, checksum: a371179b1b73dbdcdc04abc1f747b578 (MD5)","Made available in DSpace on 2011-07-01T17:55:09Z (GMT). No. of bitstreams: 1 1977_allen.pdf: 2559598 bytes, checksum: a371179b1b73dbdcdc04abc1f747b578 (MD5) Previous issue date: 1977","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-01T17:55:09Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Effect of pressure on ionic conductivity in rubidium silver iodide and silver iodide"]}]}],"canonical_facts":{"dc:contributor":["Lazarus, David"],"dc:creator":["Allen, Paul Clement"],"dc:date":["2011-07-01T17:55:09Z","10000-01-01","1977"],"dc:description":["The effect of pressure on the ionic conductivity of RbAg4I5 and AgI has been measured, using single crystals and polycrystalline samples, up to pressures of 6 kbar. The activation volumes for motion in cr-RbAg4I5 and B-RbAgI5, respectively, are -0.4 ±.2 cm3/mole and -0.2 ±.l cm3/mole. In 4a-AgI, the motion volume increases from 0.56 ±.l cm3 /mole at 435 K to 0.8 ±.l cm3/mole at 623 K. These values are unusually small in relation to the activation energies and are not consistent with the strain energy model or a domain diffusion mechanism. The negative activation volume for super-ionic RbAgIand the small size of the activation volume for cr-AgI may be 4S the result of pressure increasing the interaction enthalpy between the diffusing ions. The logarithms of the ionic conductivities of cr-and B-RbAgIin4S crease linearly at first and then decrease quadratically with pressure. This is related to the large quadratic pressure dependence of the second-order transition temperature, 6T (K) = 0.14lP (kbar) + 0.111p2 (kbar2). c The variation of the 122 K transition temperature with pressure is 6T(K) = S.6SP (kbar) -0.S3P2 (kbar2), implying a molar volume change of c VB -Vy = 0.37 ±.Ol cm3 /mole and a change in compressibility KB -Ky = 0.033 ±.OOI x 10-11 cm2/dyne, across the transition. The ionic conductivity of y-RbAg Iinitially decreases with an 4S activation volume of 9 ±l cm3/mole, and then levels off with increasing pressure. This may be the result of an extrinsic-like region or of grain-boundary conduction. The negative activation volume for conduction along the c-axis in B-AgI has been confirmed. Both low-temperature phases have large formation volumes consistent with the theory of Rice et al. of transitions to the superionic phase.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-01T17:55:09Z No. of bitstreams: 1 1977_allen.pdf: 2559598 bytes, checksum: a371179b1b73dbdcdc04abc1f747b578 (MD5)","Made available in DSpace on 2011-07-01T17:55:09Z (GMT). No. of bitstreams: 1 1977_allen.pdf: 2559598 bytes, checksum: a371179b1b73dbdcdc04abc1f747b578 (MD5) Previous issue date: 1977","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-01T17:55:09Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:34-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["252664","http://hdl.handle.net/2142/25625"],"dc:language":["en"],"dc:rights":["1977 Paul Clement Allen"],"dc:subject":["ionic conductivity","rubidium silver iodide","silver iodide","single crystals","polycrystalline"],"dc:title":["Effect of pressure on ionic conductivity in rubidium silver iodide and silver iodide"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}