{"id":{"repo_id":"umkc","oai_identifier":"oai:mospace.umsystem.edu:10355/35495"},"canonical_url":"https://search.dev.ndltd.org/etd/umkc/oai:mospace.umsystem.edu:10355/35495","repository":{"repo_id":"umkc","name":"University of Missouri - Kansas City","base_url":"https://mospace.umsystem.edu/oai/request"},"display":{"title":"Pressure-induced phase transitions in select molybdates and tungstates","abstract":"Mao-Bell and symmetric diamond anvil cells were used to study the effect of high-pressure on a series of tungstate and molybdate compounds. The experimental techniques of powder x-ray diffraction and Raman spectroscopy were employed to gain an understanding of the observed phase transitions. Bi[sub]2MoO[sub]6, exhibited a phase transition at ~6.8 GPa that was observed by a stiffening of its bulk modulus from 51 GPa, for the low-pressure phase, to 141.5 GPa for the high-pressure phase. Bi[sub]2W[sub]2O[sub]9 exhibited a phase transition at ~11 GPa that was observed by a change in the x-ray diffraction pattern. Bi[sub]2WO[sub]6 exhibited a phase transition between ~4.8 GPa and 8.3 GPa that was observed by a stiffening of its bulk modulus from 52.2 GPa, for the low-pressure phase, to 121.8 GPa for the high-pressure phase. La[sub]2Mo[sub]4O[sub]15 exhibited two phase transitions one at 2 GPa and another at 17 GPa. The transition at 2 GPa was observed as a change in the x-ray diffraction pattern and has yet to be identified. The transition at 17 GPa was to a glassy, pressure-induced amorphization, state. Sm[sub]2Mo[sub]4O[sub]15 exhibited a phase transition at 5.4 GPa. This transition was observed as a change in the x-ray diffraction pattern and has yet to be identified. MgNb[sub]2O[sub]6 exhibited a phase transition at 10.3 GPa. This transition was observed in both x-ray diffraction and Raman spectroscopy. KNbW[sub]2O[sub]9 exhibited no signs of a phase change up to a pressure of 35 GPa.","abstract_html":"Mao-Bell and symmetric diamond anvil cells were used to study the effect of high-pressure on a series of tungstate and molybdate compounds. The experimental techniques of powder x-ray diffraction and Raman spectroscopy were employed to gain an understanding of the observed phase transitions. Bi[sub]2MoO[sub]6, exhibited a phase transition at ~6.8 GPa that was observed by a stiffening of its bulk modulus from 51 GPa, for the low-pressure phase, to 141.5 GPa for the high-pressure phase. Bi[sub]2W[sub]2O[sub]9 exhibited a phase transition at ~11 GPa that was observed by a change in the x-ray diffraction pattern. Bi[sub]2WO[sub]6 exhibited a phase transition between ~4.8 GPa and 8.3 GPa that was observed by a stiffening of its bulk modulus from 52.2 GPa, for the low-pressure phase, to 121.8 GPa for the high-pressure phase. La[sub]2Mo[sub]4O[sub]15 exhibited two phase transitions one at 2 GPa and another at 17 GPa. The transition at 2 GPa was observed as a change in the x-ray diffraction pattern and has yet to be identified. The transition at 17 GPa was to a glassy, pressure-induced amorphization, state. Sm[sub]2Mo[sub]4O[sub]15 exhibited a phase transition at 5.4 GPa. This transition was observed as a change in the x-ray diffraction pattern and has yet to be identified. MgNb[sub]2O[sub]6 exhibited a phase transition at 10.3 GPa. This transition was observed in both x-ray diffraction and Raman spectroscopy. KNbW[sub]2O[sub]9 exhibited no signs of a phase change up to a pressure of 35 GPa.","abstract_has_math":false,"creators":["Scott, Paul Robert"],"institution":"University of Missouri--Kansas City","degree_name":"Ph.D.","degree_level":"Doctoral","degree_discipline":"Physics (UMKC)","degree_department":null,"school":null,"contributors":[],"advisors":["Kruger, Michael B. (Michael Brian)"],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013","date_published":"2013","updated_at":"2026-07-24T05:19:02Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10355/35495","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Kruger, Michael B. (Michael Brian)"]},{"key":"dc:creator","label":"Author","values":["Scott, Paul Robert"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2013-06-05T17:36:31Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2013-06-05T17:36:31Z"]},{"key":"dc:date.issued","label":"Date","values":["2013"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics (UMKC)","Chemistry (UMKC)"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Doctoral"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Missouri--Kansas City"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10355/35495"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Title from PDF of title page, viewed on June 5, 2013","Dissertation advisor: Michael B. Kruger","Vita","Includes bibliographic references (pages 128-136)","Thesis (Ph.D.)--Dept. of Physics and Dept. of Chemistry. University of Missouri--Kansas City, 2013"]},{"key":"dc:description.abstract","label":"Abstract","values":["Mao-Bell and symmetric diamond anvil cells were used to study the effect of high-pressure on a series of tungstate and molybdate compounds. The experimental techniques of powder x-ray diffraction and Raman spectroscopy were employed to gain an understanding of the observed phase transitions. Bi[sub]2MoO[sub]6, exhibited a phase transition at ~6.8 GPa that was observed by a stiffening of its bulk modulus from 51 GPa, for the low-pressure phase, to 141.5 GPa for the high-pressure phase. Bi[sub]2W[sub]2O[sub]9 exhibited a phase transition at ~11 GPa that was observed by a change in the x-ray diffraction pattern. Bi[sub]2WO[sub]6 exhibited a phase transition between ~4.8 GPa and 8.3 GPa that was observed by a stiffening of its bulk modulus from 52.2 GPa, for the low-pressure phase, to 121.8 GPa for the high-pressure phase. La[sub]2Mo[sub]4O[sub]15 exhibited two phase transitions one at 2 GPa and another at 17 GPa. The transition at 2 GPa was observed as a change in the x-ray diffraction pattern and has yet to be identified. The transition at 17 GPa was to a glassy, pressure-induced amorphization, state. Sm[sub]2Mo[sub]4O[sub]15 exhibited a phase transition at 5.4 GPa. This transition was observed as a change in the x-ray diffraction pattern and has yet to be identified. MgNb[sub]2O[sub]6 exhibited a phase transition at 10.3 GPa. This transition was observed in both x-ray diffraction and Raman spectroscopy. KNbW[sub]2O[sub]9 exhibited no signs of a phase change up to a pressure of 35 GPa."]},{"key":"dc:title","label":"Title","values":["Pressure-induced phase transitions in select molybdates and tungstates"]}]}],"canonical_facts":{"dc:contributor.advisor":["Kruger, Michael B. (Michael Brian)"],"dc:creator":["Scott, Paul Robert"],"dc:date.accessioned":["2013-06-05T17:36:31Z"],"dc:date.available":["2013-06-05T17:36:31Z"],"dc:date.issued":["2013"],"dc:description":["Title from PDF of title page, viewed on June 5, 2013","Dissertation advisor: Michael B. Kruger","Vita","Includes bibliographic references (pages 128-136)","Thesis (Ph.D.)--Dept. of Physics and Dept. of Chemistry. University of Missouri--Kansas City, 2013"],"dc:description.abstract":["Mao-Bell and symmetric diamond anvil cells were used to study the effect of high-pressure on a series of tungstate and molybdate compounds. The experimental techniques of powder x-ray diffraction and Raman spectroscopy were employed to gain an understanding of the observed phase transitions. Bi[sub]2MoO[sub]6, exhibited a phase transition at ~6.8 GPa that was observed by a stiffening of its bulk modulus from 51 GPa, for the low-pressure phase, to 141.5 GPa for the high-pressure phase. Bi[sub]2W[sub]2O[sub]9 exhibited a phase transition at ~11 GPa that was observed by a change in the x-ray diffraction pattern. Bi[sub]2WO[sub]6 exhibited a phase transition between ~4.8 GPa and 8.3 GPa that was observed by a stiffening of its bulk modulus from 52.2 GPa, for the low-pressure phase, to 121.8 GPa for the high-pressure phase. La[sub]2Mo[sub]4O[sub]15 exhibited two phase transitions one at 2 GPa and another at 17 GPa. The transition at 2 GPa was observed as a change in the x-ray diffraction pattern and has yet to be identified. The transition at 17 GPa was to a glassy, pressure-induced amorphization, state. Sm[sub]2Mo[sub]4O[sub]15 exhibited a phase transition at 5.4 GPa. This transition was observed as a change in the x-ray diffraction pattern and has yet to be identified. MgNb[sub]2O[sub]6 exhibited a phase transition at 10.3 GPa. This transition was observed in both x-ray diffraction and Raman spectroscopy. KNbW[sub]2O[sub]9 exhibited no signs of a phase change up to a pressure of 35 GPa."],"dc:identifier.uri":["http://hdl.handle.net/10355/35495"],"dc:title":["Pressure-induced phase transitions in select molybdates and tungstates"],"dc:type":["Thesis"],"thesis:degree_discipline":["Physics (UMKC)","Chemistry (UMKC)"],"thesis:degree_level":["Doctoral"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Missouri--Kansas City"]},"updated_at":"2026-07-24T05:19:02Z"}