http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
장영남(Young Nam Jang),채수천(Soo Chun Chae),배인국(In Kook Bae),(Sergey V. Yudintsev) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.1
New pyrochlore-type phases(A_2B_2O_7) were synthesized in the systems: CaO-CeO_2-TiO_2, CaO-UO_2(ThO_2)-ZrO_2, CaO-UO_2(ThO_2)-Gd_2O_3-TiO_3-TiO_2-ZrO_2 and CaO-ThO_2-SnO_2. The starting materials were pressed with the pressure of 200∼400 MPa and sintered at 1500∼1550℃ for 4∼8 hours in air and at 1300∼1350 ℃ for 5∼50 hours under oxygen atmosphere. The products were charactierized using XRD, SEM/EDS and TEM. In the bulk compositions of CaCeTi_2O_7, CaThZr_2O_7, (Ca_0.5GdTh_0.5)(ZrTi)O_7, (Ca_0.5GdU_0.5)(ZrTi)O_7 and CaThSn_2O_7, pyrochlore was the major phase, together with other oxide phase of fluorite structure. In the samples with target compositions CaUzr_2O_7 and Ca_0.5GdU_0.5Zr_2O_7, pyrochlore was not identified, but a fluorite-structured phase was detected. The formation factor as the stable phase depended on crystal chemical characteristics of the actinide and lanthanide elements of the system concerned.