Properties of (CH)NHH PO crystal near the ferroelectric phase transition
Journal of Physics Condensed Matter, ISSN: 0953-8984, Vol: 20, Issue: 21
2008
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Article Description
The results of dielectric, thermal (AC calorimetry) and dilatometric measurements on DMAP crystal in the ferroelectric phase transition region are presented. The experimental data are discussed in the framework of the Landau theory, and expansion coefficients of the Landau potential A, B, C are estimated. A temperature dependence of the effective nonlinearity coefficient B has been revealed. The pressure coefficient dT/dp was obtained. The phase transition can be classified as a continuous one and rather far from the tricritical point. The specific heat data show a λ-type anomaly and the value of the excess entropy is smaller than in typical order-disorder phase transitions. © 2008 IOP Publishing Ltd.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=77953574945&origin=inward; http://dx.doi.org/10.1088/0953-8984/20/21/215222; https://iopscience.iop.org/article/10.1088/0953-8984/20/21/215222; http://stacks.iop.org/0953-8984/20/i=21/a=215222/pdf; https://dx.doi.org/10.1088/0953-8984/20/21/215222; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=fd7a42fb-16ae-4d4b-8beb-15eb4913c635&ssb=55735206663&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F0953-8984%2F20%2F21%2F215222&ssi=cfd35689-8427-45e9-9a7c-4ce66f695fe0&ssk=support@shieldsquare.com&ssm=53932303202613836353503725338579239&ssn=fb68711a5ffec41c06022f07a090bbed9eaf17c5ab98-6cb9-4002-93488f&sso=f3699673-5afc0bb0524707fde7af74660d796188cc785270b527008c&ssp=70343535821718072009171845079620499&ssq=22561560578681131792599480467046225002392&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJfX3V6bWYiOiI3ZjYwMDAwZDMzMWM4YS1iODM3LTQ4MzEtYjhjNy01MGVmOGE2YTAyMjMxNzE4MDk5NDgwNzkxMzA2MzA1NDM2LTk3YWRjZDYyYWI1YjllNTUzNTM0MSIsInJkIjoiaW9wLm9yZyIsInV6bXgiOiI3ZjkwMDAwMzkxMjc0Ny01NzFjLTRhMTEtYjUzZS00YWNmNDcwOWM2Y2I0LTE3MTgwOTk0ODA3OTEzMDYzMDU0MzYtY2ZiNGRhYWUzYTY3MTNkNTM1MzQxIn0=
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