Crystal field analysis of Nd3+and Er3+in Bi4Ge3O12

摘要

The experimental optical spectra of Nd3+and Er3+in singlehyphen;crystal Bi4Ge3O12are analyzed with a crystalhyphen;field HamiltonianHx= Sgr;nmthinsp;Bdeg;nmthinsp;Sgr;ithinsp;Cnmthinsp;(quest;i@qL) appropriate forC3symmetry. The resulting besthyphen;fitBnm(all in cmminus;1) areB20=minus;833,B40=minus;705,B43=1713,B60=594,RB63=minus;203,IB63=103,RB66=552, andIB66=minus;343 cmminus;1, with an rms deviation of 5.1 cmminus;1for Nd3+, andB20=minus;732,B40=minus;920,B43=1626,B60=477,RB63=minus;33,IB63=minus;44,RB66=324, andIB66=minus;58 cmminus;1, with an rms deviation of 4.6 cmminus;1for Er3+. Juddndash;Ofelt intensity parameters were calculatedapriorifrom pointhyphen;charge lattice sums. A set of smoothedBnmare given for the entire lanthanide series.