In Situ Synchrotron X‐Ray Diffraction Study of the Rhombohedral‐to‐HT‐Cubic Phase Transformation in Ln6WO12 (Ln = Y, Ho, Er, Yb)

Journal of the American Ceramic Society - Tập 97 Số 4 - Trang 1256-1263 - 2014
Zlatomir D. Apostolov1, Pankaj Sarin1, Robert W. Hughes1, Waltraud M. Kriven1
1Department of Material Science and Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801

Tóm tắt

The high‐temperature rhombohedral‐to‐fcc phase transformation in the Ln6WO12 (Ln = Y, Ho, Er, Yb) system was investigated by thermal analysis and in situ X‐ray diffraction. The process was characterized by thermodynamic, kinetic, and mechanistic criteria, and the role of the rare‐earth cation on the transformation properties trends was evaluated. An atomistic perspective on the accompanying structural change is presented, as well as a characterization of the associated shape and volume changes. A twofold comparison is performed with the similar low‐temperature fcc‐to‐rhombohedral transformation in the same system. One aspect contrasts the structural changes related to each process, manifested by the behavior of the lattice parameters and transformation characteristics. The second concerns the sequence of transformations according to composition and suggests the order of thermal stability of Ln polyhedra in each phase.

Từ khóa


Tài liệu tham khảo

10.1126/science.272.5258.90

10.1006/jssc.1998.7967

10.1038/425674a

10.1246/bcsj.50.2932

10.1021/cm980157e

10.1016/j.ssi.2007.01.004

10.1149/1.2374948

10.1021/cm900067k

10.1021/ic50005a043

10.1021/ic50039a012

10.1006/jssc.1998.7744

10.1006/jssc.1999.8502

10.1016/j.mseb.2004.08.015

10.1016/j.solidstatesciences.2004.07.023

10.1021/cm900650c

10.1023/A:1012557411736

Amosov V. M., 1968, The Preparation and Properties of Dysprosium and Holmium Tungstates, Zh. Prikl. Khim., 41, 1643

10.1107/S0365110X63001985

10.1063/1.1734285

10.1111/j.1151-2916.1980.tb09853.x

10.1111/jace.12119

10.1111/j.1151-2916.1998.tb02684.x

10.1017/S088571560001112X

10.1103/PhysRevLett.70.4087

Dove M. T., 2011, The Re‐Entrant Phase Transitions in Crystalline Malononitrile, CH2(CN)2: A Neutron Powder Diffraction Study, J. Phys.: Condens. Matter, 23, 225402

10.1524/zkri.2011.1286

10.1557/JMR.1999.0462

J.Bai X14 Bending Magnet Beamline Instrumentation and Technical Information 2008. beamlines.ps.bnl.gov/beamline.aspx?blid=X14A

10.1063/1.2349600

Scherrer P., 1918, Göttinger Nachrichten, Math. Phys., 2, 98

Speyer R. F., 1994, Thermal Analysis of Materials, 85

10.1146/annurev.ms.01.080171.001153

10.1016/B978-008042145-2/50017-1

Christian J. W., 1995, Classification of Displacive Transformations: What is a Martensitic Transformation?, J. Phys. IV, 5, 3

Delaey L., 2001, Phase Transformations in Materials, 583, 10.1002/352760264X.ch9

10.1016/0001-6160(59)90096-3

10.1016/0001-6160(54)90194-7

10.1007/s11182-005-0016-2

10.1002/pssb.19680300229

Porter D. A., 2009, Phase Transformations in Metals and Alloys

Bała P., 2009, The Kinetics of Phase Transformations During Continuous Heating From As‐Quenched State in High‐Speed Steels, Arch. Mater. Sci. Eng., 37, 5

10.1107/S0567739476001551

Thông tin
Thông tin xuất bản

Journal of the American Ceramic Society

Tập 97 Số 4

1256-1263

Thông tin tác giả