Ordering behaviour at the antiferrodistortive phase transition in betaine phosphate and betaine phosphite
Deuterated single crystals of betaine phosphate (BP) and betaine phosphite (BPI) are investigated by means of 2 H NMR measurements in order to study the behaviour at the antiferrodistortive phase transitions. The experimental data are interpreted in terms of a microscopic order-disorder model. For t...
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| Veröffentlicht in: | Ferroelectrics 1998-04, Vol.208-209 (1), p.93-103 |
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| container_title | Ferroelectrics |
| container_volume | 208-209 |
| creator | Freude, P. Michel, D. Totz, J. Klöpperpieper, A. |
| description | Deuterated single crystals of betaine phosphate (BP) and betaine phosphite (BPI) are investigated by means of
2
H NMR measurements in order to study the behaviour at the antiferrodistortive phase transitions. The experimental data are interpreted in terms of a microscopic order-disorder model. For the temperature dependence of the order parameter according to p ∝ |T
c
- T|
β
a value β was found to be close to 0·25 for both crystals. In accordance with measurements of the heat capacity, this points to a behaviour which is similar to the case of a tricritical point. Our data can also be explained on the basis of the assumption of a temperature dependent fourth-order coefficient in the Landau free energy as has been recently discussed theoretically. |
| doi_str_mv | 10.1080/00150199808014870 |
| format | Article |
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2
H NMR measurements in order to study the behaviour at the antiferrodistortive phase transitions. The experimental data are interpreted in terms of a microscopic order-disorder model. For the temperature dependence of the order parameter according to p ∝ |T
c
- T|
β
a value β was found to be close to 0·25 for both crystals. In accordance with measurements of the heat capacity, this points to a behaviour which is similar to the case of a tricritical point. Our data can also be explained on the basis of the assumption of a temperature dependent fourth-order coefficient in the Landau free energy as has been recently discussed theoretically.</description><identifier>ISSN: 0015-0193</identifier><identifier>EISSN: 1563-5112</identifier><identifier>DOI: 10.1080/00150199808014870</identifier><language>eng</language><publisher>Taylor & Francis Group</publisher><subject>betaine phosphate ; betaine phosphite ; Ferroelectrics ; H NMR ; order-disorder behaviour ; phase transition</subject><ispartof>Ferroelectrics, 1998-04, Vol.208-209 (1), p.93-103</ispartof><rights>Copyright Taylor & Francis Group, LLC 1998</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c344t-9815d16d6fa4d32c259abd961b133c3c9ef07bc8cccbf2636ed51817afe4c5c33</citedby><cites>FETCH-LOGICAL-c344t-9815d16d6fa4d32c259abd961b133c3c9ef07bc8cccbf2636ed51817afe4c5c33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.tandfonline.com/doi/pdf/10.1080/00150199808014870$$EPDF$$P50$$Ginformaworld$$H</linktopdf><linktohtml>$$Uhttps://www.tandfonline.com/doi/full/10.1080/00150199808014870$$EHTML$$P50$$Ginformaworld$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,59620,60409</link.rule.ids></links><search><creatorcontrib>Freude, P.</creatorcontrib><creatorcontrib>Michel, D.</creatorcontrib><creatorcontrib>Totz, J.</creatorcontrib><creatorcontrib>Klöpperpieper, A.</creatorcontrib><title>Ordering behaviour at the antiferrodistortive phase transition in betaine phosphate and betaine phosphite</title><title>Ferroelectrics</title><description>Deuterated single crystals of betaine phosphate (BP) and betaine phosphite (BPI) are investigated by means of
2
H NMR measurements in order to study the behaviour at the antiferrodistortive phase transitions. The experimental data are interpreted in terms of a microscopic order-disorder model. For the temperature dependence of the order parameter according to p ∝ |T
c
- T|
β
a value β was found to be close to 0·25 for both crystals. In accordance with measurements of the heat capacity, this points to a behaviour which is similar to the case of a tricritical point. Our data can also be explained on the basis of the assumption of a temperature dependent fourth-order coefficient in the Landau free energy as has been recently discussed theoretically.</description><subject>betaine phosphate</subject><subject>betaine phosphite</subject><subject>Ferroelectrics</subject><subject>H NMR</subject><subject>order-disorder behaviour</subject><subject>phase transition</subject><issn>0015-0193</issn><issn>1563-5112</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNqFkE1LAzEQhoMoWKs_wFv-wGpms9ndgBcpaoVCL3pesvmwkXZTJrHaf2-WerKIp-Gdd575IuQa2A2wlt0yBoKBlG0WULUNOyETEDUvBEB5SiajX-QCfk4uYnzPkleVnBC_RGPRD2-0tyu18-EDqUo0rSxVQ_LOIgbjYwqY_M7S7UpFSxOqIfrkw0D9kMGk_DB6IWY_jaT5lfXJXpIzp9bRXv3EKXl9fHiZzYvF8ul5dr8odN4oFbIFYaA2tVOV4aUuhVS9kTX0wLnmWlrHml63WuvelTWvrRHQQqOcrbTQnE8JHPpqDDGidd0W_UbhvgPWjb_qjn6VmebA-MEF3KjPgGvTJbVfB3T5WO3jMdWlr5TJu39J_vfgb_zyhK4</recordid><startdate>19980401</startdate><enddate>19980401</enddate><creator>Freude, P.</creator><creator>Michel, D.</creator><creator>Totz, J.</creator><creator>Klöpperpieper, A.</creator><general>Taylor & Francis Group</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19980401</creationdate><title>Ordering behaviour at the antiferrodistortive phase transition in betaine phosphate and betaine phosphite</title><author>Freude, P. ; Michel, D. ; Totz, J. ; Klöpperpieper, A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c344t-9815d16d6fa4d32c259abd961b133c3c9ef07bc8cccbf2636ed51817afe4c5c33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>betaine phosphate</topic><topic>betaine phosphite</topic><topic>Ferroelectrics</topic><topic>H NMR</topic><topic>order-disorder behaviour</topic><topic>phase transition</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Freude, P.</creatorcontrib><creatorcontrib>Michel, D.</creatorcontrib><creatorcontrib>Totz, J.</creatorcontrib><creatorcontrib>Klöpperpieper, A.</creatorcontrib><collection>CrossRef</collection><jtitle>Ferroelectrics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Freude, P.</au><au>Michel, D.</au><au>Totz, J.</au><au>Klöpperpieper, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ordering behaviour at the antiferrodistortive phase transition in betaine phosphate and betaine phosphite</atitle><jtitle>Ferroelectrics</jtitle><date>1998-04-01</date><risdate>1998</risdate><volume>208-209</volume><issue>1</issue><spage>93</spage><epage>103</epage><pages>93-103</pages><issn>0015-0193</issn><eissn>1563-5112</eissn><abstract>Deuterated single crystals of betaine phosphate (BP) and betaine phosphite (BPI) are investigated by means of
2
H NMR measurements in order to study the behaviour at the antiferrodistortive phase transitions. The experimental data are interpreted in terms of a microscopic order-disorder model. For the temperature dependence of the order parameter according to p ∝ |T
c
- T|
β
a value β was found to be close to 0·25 for both crystals. In accordance with measurements of the heat capacity, this points to a behaviour which is similar to the case of a tricritical point. Our data can also be explained on the basis of the assumption of a temperature dependent fourth-order coefficient in the Landau free energy as has been recently discussed theoretically.</abstract><pub>Taylor & Francis Group</pub><doi>10.1080/00150199808014870</doi><tpages>11</tpages></addata></record> |
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| ispartof | Ferroelectrics, 1998-04, Vol.208-209 (1), p.93-103 |
| issn | 0015-0193 1563-5112 |
| language | eng |
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| source | Taylor & Francis:Master (3349 titles) |
| subjects | betaine phosphate betaine phosphite Ferroelectrics H NMR order-disorder behaviour phase transition |
| title | Ordering behaviour at the antiferrodistortive phase transition in betaine phosphate and betaine phosphite |
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