202003brupia0journalOriginalBrunetti, B.[Bruno]Piacente, V.[Vincenzo]Scardala, P.[Paolo]J. Chem. Eng. Data20032003-07-22Standard Sublimation Enthalpies of Erbium Trichloride, Tribromide, and TriiodideThe total vapor pressures of the erbium trihalides ErCl3, ErBr3, and ErI3 were measured by the torsion method, and their temperature dependences can be expressed by the following equations over the given temperature ranges: ErCl3(s), log(p/kPa) = 12.04 +- 0.15 - (15159 +- 200)(K/T) from (880 to 1040) K; ErBr3(s), log(p/kPa) = 11.09 +- 0.15 - (14256 +- 200)(K/T) from (919 to 1058) K; ErI3(s), log(p/kPa) = 11.55 +- 0.15 - (13862 +- 200)(K/T) from (871 to 1082) K. Treating the results by second- and third-law methods, the standard sublimation enthalpies were determined to be subH(298 K) = {(308 +- 4) kJ mol-1 and (293 +- 4) kJ mol-1} for ErCl3 and ErBr3, respectively. For ErI3 the proposed enthalpy, subH(298 K) = (282 +- 6) kJ mol-1, was only derived by the second-law method. From this standard enthalpy a set of free energy functions for solid ErI3 was evaluated by third-law treatment of the data.sublimation enthalpieserbium trihalides.48946-9501erbium trichlorideCl3Er1Commercial source199.83Not known2None used2erbium bromide (ErBr3)Br3Er1Commercial source199.83Not known2None used3erbium iodide (ErI3)ErI31Commercial source199.83Not known2None used11Principal objective of the workALHTRC7/10/20031Vapor or sublimation pressure, kPaOtherCrystalDirect value, XCrystalGas1Temperature, K192931.00005013194331.00008513195831.00015144196831.00021884197831.00032364198631.00043654199531.000575441100441.000776241101341.001096551102141.001445451103141.00213851104041.00281845194831.00013494195831.00018624196831.00026924197731.00039814198331.00048984199031.0006314199731.000831841101441.001412551102541.001949851103341.002511951104041.00316235190731.0000173192331.00003393193531.00005013194931.00008513196331.00015144197631.00023444199031.000407441100341.000660741101641.001071551103041.001513651104041.00234425192031.00003393193231.00005013193631.00006763195331.00013494196331.00020424197231.00026924198131.00037154199031.00050124199931.000676141100841.000933341101741.001288251102541.001698251103441.00251195192531.00004273193231.00005013194331.00008513195231.00011754196331.00016984197031.00021884197831.00032364198631.00043654199531.00063141100341.000851141101241.001071551102241.001513651103041.001949851103741.00245475189731.00002143190731.00003243191631.00005133192531.00006923193531.00010724194331.00014794195031.00019954195931.00027544196831.00037154188031.00001073189231.00001583190331.00002693191331.00004273192131.00005893193331.00010234194331.00014454195131.00019954196031.00027544197031.00038024193231.00004273194331.00006463195431.00014196331.00014454197731.00024554198831.00034674199831.000478641100841.000676141101841.000933341102841.0013183521Principal objective of the workALHTRC7/10/20031Vapor or sublimation pressure, kPaOtherCrystalDirect value, XCrystalGas1Temperature, K196131.00019954197031.00026924197731.00034674198831.00047864199331.00056234199831.00063141100741.000831841101041.000977241102541.001698251103341.00213851104541.002951251105141.003630851105841.00436525194231.00008913195231.0001234196231.00017784196631.00019954197031.00024554197931.00033114198931.00046774199831.000616641100941.00087141101841.001148251102541.001445451103641.00204175191931.00002823193031.00004173194131.00007083194831.00009773195931.00014134196831.0001824197931.00028184199331.000416941100841.000676141102041.00151103341.00158495193031.00007083194231.00011224195631.0001824197131.00029514198431.00048984199831.000794341100441.000933341101541.00134951102841.002089351103641.00257045195431.00014134196431.0001954197331.00026924198231.00036314199031.00048984199831.000616641100841.000851141101841.00112251102641.001513651103641.002089351104541.002818451105641.0038905531Principal objective of the workALHTRC7/10/20031Vapor or sublimation pressure, kPaOtherCrystalDirect value, XCrystalGas1Temperature, K187131.00005373188931.00009333189831.00013494190631.00019954191831.00029514193631.00061664194831.0009554196331.00169825197931.00295125199231.004265851100641.00691835187331.00005373188631.00007943189731.00013494190331.00016224191231.00021384192931.00037154194031.00056234194731.00074134195931.00123035197131.00190555198631.00323595199931.00478635187631.00008513188431.00010724189131.00014794189831.00019054190431.00023444191231.00031624191831.00040744192431.00051294193031.0006314193631.00083184194331.00107155194931.0013495195631.00169825196831.00257045197431.00316235198031.00380195191531.00023444192431.00033884193231.00041694194031.0005374195031.00077624195731.00097724196331.00120235196931.00151365197631.00204175198231.00251195199031.00323595199731.004168751100441.005128651101241.006760851101841.00812835189031.00010474190431.00020894191331.00026924192331.00041694193031.0005374194031.00075864194931.00102335195831.00144545196631.00194985197431.00257045198331.00338845199231.004466851100141.006309651101041.007943351101941.01047136188631.00010474190331.00020894191331.0003024193031.00057544193931.00075864194931.00104715196231.00169825197331.00245475198431.00354815199431.004786351100441.006456551101141.00831765197831.0028845198931.00426585199931.005754451100741.007079551101741.0161102641.013182661103641.017782861104641.024547161105941.035481361107041.048977961108241.06918316188631.00005753190731.00012884192831.00027544194631.00051294196631.00102335198131.00177835199531.002951251100841.00467745191631.00017384192831.00027544193731.00036314194531.00047864195531.00064574196331.00089134197231.00123035198031.00162185198831.00208935199631.002754251100841.003890551101641.00512865193431.00028844195231.0005374196131.00074134197431.00117495198731.001819751100141.00288451101541.004570951103041.006918351104541.01023296