{"id":{"repo_id":"nps","oai_identifier":"oai:calhoun.nps.edu:10945/15086"},"canonical_url":"https://search.dev.ndltd.org/etd/nps/oai:calhoun.nps.edu:10945/15086","repository":{"repo_id":"nps","name":"Naval Postgraduate School","base_url":"https://calhoun.nps.edu/server/oai/request"},"display":{"title":"Measurements of the spontaneous polarization in KH(2)PO(2)","abstract":"Measurements of the spontaneous polarization of KH(2)PO(4) within 1 K if the ferroelectric transition are reported. the measurement employed the electrocaloric effect, allowing simultaneous determination of the polarization and its temperature derivative. The derivative computed from polarization measurements compares well with direct determinations of (OP/OT)e, demonstrating thermodynamic consistency of the measurements. The transition is first order with a discontinuous jump in the polarization of 1.87 uc/cm(2) at the transition. Laudau theory allows separate calculation at specific heat contributions of the lattice and polarization and thus the total specific heat, which agrees very well with direct calorimetric determinations, although the decomposition differs from that previously assumed. This indicates that Landau theory provides a good description of the transition in KH(2)PO(4) and that there is a calorimetric anomaly not directly associated with the polarization. The free energy expansion best fitting the data contains P(4) and P(8) terms and no P(6) term.","abstract_html":"Measurements of the spontaneous polarization of KH(2)PO(4) within 1 K if the ferroelectric transition are reported. the measurement employed the electrocaloric effect, allowing simultaneous determination of the polarization and its temperature derivative. The derivative computed from polarization measurements compares well with direct determinations of (OP/OT)e, demonstrating thermodynamic consistency of the measurements. The transition is first order with a discontinuous jump in the polarization of 1.87 uc/cm(2) at the transition. Laudau theory allows separate calculation at specific heat contributions of the lattice and polarization and thus the total specific heat, which agrees very well with direct calorimetric determinations, although the decomposition differs from that previously assumed. This indicates that Landau theory provides a good description of the transition in KH(2)PO(4) and that there is a calorimetric anomaly not directly associated with the polarization. The free energy expansion best fitting the data contains P(4) and P(8) terms and no P(6) term.","abstract_has_math":false,"creators":["Benepe, John Wesley"],"institution":"Monterey, California; Naval Postgraduate School","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Department of Physics","school":null,"contributors":[],"advisors":["Reese, W."],"committee_chairs":[],"committee_members":[],"year":1970,"date_issued":"1970-12","date_published":"1970-12","updated_at":"2026-07-27T20:24:23Z","subjects":[],"languages":["en_US"],"rights":["This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10945/15086","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Reese, W."]},{"key":"dc:contributor.department","label":"Department","values":["Department of Physics"]},{"key":"dc:creator","label":"Author","values":["Benepe, John Wesley"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["December 1970"]},{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2012-11-01T22:55:18Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2012-11-01T22:55:18Z"]},{"key":"dc:date.issued","label":"Date","values":["1970-12"]},{"key":"dc:publisher","label":"Institution","values":["Monterey, California; Naval Postgraduate School"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]},{"key":"dc:rights","label":"Dc Rights","values":["This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10945/15086"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Measurements of the spontaneous polarization of KH(2)PO(4) within 1 K if the ferroelectric transition are reported. the measurement employed the electrocaloric effect, allowing simultaneous determination of the polarization and its temperature derivative. The derivative computed from polarization measurements compares well with direct determinations of (OP/OT)e, demonstrating thermodynamic consistency of the measurements. The transition is first order with a discontinuous jump in the polarization of 1.87 uc/cm(2) at the transition. Laudau theory allows separate calculation at specific heat contributions of the lattice and polarization and thus the total specific heat, which agrees very well with direct calorimetric determinations, although the decomposition differs from that previously assumed. This indicates that Landau theory provides a good description of the transition in KH(2)PO(4) and that there is a calorimetric anomaly not directly associated with the polarization. The free energy expansion best fitting the data contains P(4) and P(8) terms and no P(6) term."]},{"key":"dc:title","label":"Title","values":["Measurements of the spontaneous polarization in KH(2)PO(2)"]}]}],"canonical_facts":{"dc:contributor.advisor":["Reese, W."],"dc:contributor.department":["Department of Physics"],"dc:creator":["Benepe, John Wesley"],"dc:date":["December 1970"],"dc:date.accessioned":["2012-11-01T22:55:18Z"],"dc:date.available":["2012-11-01T22:55:18Z"],"dc:date.issued":["1970-12"],"dc:description.abstract":["Measurements of the spontaneous polarization of KH(2)PO(4) within 1 K if the ferroelectric transition are reported. the measurement employed the electrocaloric effect, allowing simultaneous determination of the polarization and its temperature derivative. The derivative computed from polarization measurements compares well with direct determinations of (OP/OT)e, demonstrating thermodynamic consistency of the measurements. The transition is first order with a discontinuous jump in the polarization of 1.87 uc/cm(2) at the transition. Laudau theory allows separate calculation at specific heat contributions of the lattice and polarization and thus the total specific heat, which agrees very well with direct calorimetric determinations, although the decomposition differs from that previously assumed. This indicates that Landau theory provides a good description of the transition in KH(2)PO(4) and that there is a calorimetric anomaly not directly associated with the polarization. The free energy expansion best fitting the data contains P(4) and P(8) terms and no P(6) term."],"dc:identifier.uri":["https://hdl.handle.net/10945/15086"],"dc:language.iso":["en_US"],"dc:publisher":["Monterey, California; Naval Postgraduate School"],"dc:rights":["This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States."],"dc:title":["Measurements of the spontaneous polarization in KH(2)PO(2)"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T20:24:23Z"}