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  • 标题:Calculation of the Spontaneous Polarization and the Dielectric Constant as a Function of Temperature for <svg style="vertical-align:-4.32007pt;width:78.6875px;" id="M1" height="20.4125" version="1.1" viewBox="0 0 78.6875 20.4125" width="78.6875" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(.022,0,0,-.022,.062,14.975)"><path id="x4B" d="M667 0h-153l-248 291q-28 32 -54 27v-190q0 -65 14.5 -80t77.5 -20v-28h-260v28q58 5 71 20t13 80v392q0 48 -6 66.5t-22 25.5t-59 10v28h258v-28q-59 -5 -73 -20.5t-14 -81.5v-175q29 6 70 45q101 97 167 178q23 27 20 37t-36 14l-23 3v28h240v-28q-57 -5 -86 -18.5&#xD;&#xA;t-76 -56.5q-40 -35 -177 -175q97 -124 235 -272q39 -41 61.5 -54t59.5 -18v-28z"/></g><g transform="matrix(.022,0,0,-.022,15.149,14.975)"><path id="x48" d="M729 650v-28q-62 -5 -76 -19.5t-14 -75.5v-404q0 -62 13.5 -76t75.5 -19v-28h-268v28q65 5 79.5 19t14.5 76v199h-341v-199q0 -62 14 -76t76 -19v-28h-263v28q61 5 74.5 19t13.5 76v404q0 62 -14 76t-76 19v28h259v-28q-58 -5 -71 -19t-13 -76v-162h341v162&#xD;&#xA;q0 61 -13.5 75.5t-72.5 19.5v28h261z"/></g> <g transform="matrix(.016,0,0,-.016,32.325,20.35)"><path id="x1D7D0" d="M453 211h25l-46 -211h-415v23q97 102 151 166q42 49 81 110q51 78 51 148q0 56 -31.5 91.5t-87.5 35.5q-77 0 -122 -90h-28q67 204 223 204q82 0 132 -49.5t50 -133.5q0 -110 -114 -218l-162 -154h140q82 0 107 13q27 13 46 65z"/></g> <g transform="matrix(.022,0,0,-.022,40.788,14.975)"><path id="x50" d="M46 650h247q112 0 169 -41q64 -49 64 -141q0 -91 -56.5 -143t-138.5 -62q-23 -3 -45 -1l-74 19v-157q0 -63 15.5 -77t83.5 -19v-28h-271v28q60 5 74 20t14 77v400q0 65 -12.5 79t-69.5 18v28zM212 559v-245q31 -12 73 -12q59 0 102 38t43 124q0 77 -42.5 115.5&#xD;&#xA;t-108.5 38.5q-44 0 -56 -12q-11 -8 -11 -47z"/></g><g transform="matrix(.022,0,0,-.022,53.408,14.975)"><path id="x4F" d="M381 665q131 0 226.5 -93t95.5 -239q0 -158 -96 -253t-238 -95q-137 0 -231 95t-94 238q0 142 92.5 244.5t244.5 102.5zM359 629q-89 0 -151 -74.5t-62 -208.5q0 -141 69 -233t175 -92q90 0 150.5 74t60.5 211q0 152 -69 237.5t-173 85.5z"/></g> <g transform="matrix(.016,0,0,-.016,70.15,20.35)"><path id="x1D7D2" d="M476 255v-111h-64v-144h-145v144h-248v113l313 431h80v-433h64zM60 255h208v294z"/></g> </svg>
  • 本地全文:下载
  • 作者:Hamit Yurtseven ; Sema Şen
  • 期刊名称:Advances in Condensed Matter Physics
  • 印刷版ISSN:1687-8108
  • 电子版ISSN:1687-8124
  • 出版年度:2012
  • 卷号:2012
  • DOI:10.1155/2012/259712
  • 出版社:Hindawi Publishing Corporation
  • 摘要:The temperature dependence of the spontaneous polarization P is calculated in the ferroelectric phase of KH2PO4 (KDP) at atmospheric pressure (TC = 122&#x2009;K). Also, the dielectric constant &#x3b5; is calculated at various temperatures in the paraelectric phase of KDP at atmospheric pressure. For this calculation of P and &#x3b5;, by fitting the observed Raman frequencies of the soft mode, the microscopic parameters of the pure tunnelling model are obtained. In this model, the proton-lattice interaction is not considered and the collective proton mode is identified with the soft-mode response of the system. Our calculations show that the spontaneous polarization decreases continuously in the ferroelectric phase as approaching the transition temperature TC. Also, the dielectric constant decreases with increasing temperature and it diverges in the vicinity of the transition temperature (TC = 122&#x2009;K) for KDP according to the Curie-Weiss law.
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