%0 Journal Article %1 WOS:000088137100008 %A Melo, FEA %A Moreira, SGC %A Chaves, AS %A Guedes, I %A Freire, PTC %A Mendes, J %C 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND %D 1999 %I TAYLOR & FRANCIS LTD %J FERROELECTRICS %K diagram} phase spectroscopy; transitions; {Raman %N 1-2 %P 67-75 %R 10.1080/00150199908016997 %T Phase diagram uniaxial pressure-temperature of KDP %V 233 %X In this work we present for the first time the uniaxial pressure - temperature phase diagram of KDP, for temperatures near the ferroelectric phase transition at 122 K. It is observed from Raman measurements that under uniaxial pressure the KDP undergoes two metastable transitions: (i) from tetragonal D-2d(12) phase to orthorhombic C-2v(j not equal 19) phase at 126 K and sigma(6) = 1.12 kbar, and (ii) from orthorhombic C-2v(19) phase to the same orthorhombic C-2v(j not equal 19) phase as before, at 110 K and sigma(6) = 0.3 kbar. The reversibility paths of these metastable phases are discussed and an explanation to the appearance of the C-2v(j not equal 19) phase, based on the Gibbs Free energy density of the system, is presented.

@article{WOS:000088137100008, abstract = {In this work we present for the first time the uniaxial pressure - temperature phase diagram of KDP, for temperatures near the ferroelectric phase transition at 122 K. It is observed from Raman measurements that under uniaxial pressure the KDP undergoes two metastable transitions: (i) from tetragonal D-2d(12) phase to orthorhombic C-2v(j not equal 19) phase at 126 K and sigma(6) = 1.12 kbar, and (ii) from orthorhombic C-2v(19) phase to the same orthorhombic C-2v(j not equal 19) phase as before, at 110 K and sigma(6) = 0.3 kbar. The reversibility paths of these metastable phases are discussed and an explanation to the appearance of the C-2v(j not equal 19) phase, based on the Gibbs Free energy density of the system, is presented.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND}, author = {Melo, FEA and Moreira, SGC and Chaves, AS and Guedes, I and Freire, PTC and Mendes, J}, biburl = {https://www.bibsonomy.org/bibtex/20a265b4c5e95beda58db61604882b157/ppgfis_ufc_br}, doi = {10.1080/00150199908016997}, interhash = {84320f64986e5a4dbe9f39695f6c4e8b}, intrahash = {0a265b4c5e95beda58db61604882b157}, issn = {0015-0193}, journal = {FERROELECTRICS}, keywords = {diagram} phase spectroscopy; transitions; {Raman}, note = {2nd International Seminar on Physics of Ferroelastics, KAZAN, RUSSIA, JUN 25-27, 1997}, number = {1-2}, organization = {Kazan State Univ; Kazan Phys Tech Inst; Moscow Power Energet Inst, Kazan Branch; Russian Fdn Basic Res; State Comm High Educ; Gordon & Breach Publishing Grp; Kazan Phys Soc}, pages = {67-75}, publisher = {TAYLOR & FRANCIS LTD}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Phase diagram uniaxial pressure-temperature of KDP}, tppubtype = {article}, volume = 233, year = 1999 }