Preparation of apatite-type La9.33Ge6O26 single-crystal from sintered ceramics by a seeding method and its oxide ionic conduction

AbstractA theoretical model of microwave absorption in linear dielectric (non-ferroelectric) ionic crystals that takes into account the presence of point defects was synthesized and verified using NaCl single crystals. In the next stage of this research, we will introduce a controlled density of dislocations into the single crystal NaCl samples and study the effect on the microwave absorption mechanisms (ionic conduction, dielectric relaxation and multi-phonon processes) both theoretically and experimentally. Qualitative outlines of this modified theory are presented. The loss factor ε’ has been measured in the dislocation-free case by a cavity resonator insertion technique and the experimental results are in good agreement with the theoretical model. We describe the sample preparation technique that will be used to produce a controlled dislocation density in single crystal samples that will also be studied in our cavity resonator insertion system.

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Oxide ionic conductivity of apatite type Nd9·33(SiO4)6O2 single crystal

Journal of the European Ceramic Society ◽

10.1016/s0955-2219(98)00215-5 ◽

1999 ◽

Vol 19 (4) ◽

pp. 507-510 ◽

Cited By ~ 125

Author(s):

Susumu Nakayama ◽

Masatomi Sakamoto ◽

Mikio Higuchi ◽

Kohei Kodaira ◽

Mineo Sato ◽

...

Keyword(s):

Ionic Conductivity ◽

Single Crystal ◽

Oxide Ionic Conductivity ◽

Apatite Type

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Single crystal growth and oxide ion conductivity of apatite-type rare-earth silicates

Solid State Ionics ◽

10.1016/j.ssi.2004.05.028 ◽

2004 ◽

Vol 174 (1-4) ◽

pp. 73-80 ◽

Cited By ~ 59

Author(s):

M HIGUCHI ◽

Y MASUBUCHI ◽

S NAKAYAMA ◽

S KIKKAWA ◽

K KODAIRA

Keyword(s):

Rare Earth ◽

Crystal Growth ◽

Single Crystal ◽

Single Crystal Growth ◽

Ion Conductivity ◽

Oxide Ion Conductivity ◽

Oxide Ion ◽

Apatite Type

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Elaboration and Ionic Conduction of Apatite-Type Rare Earth Oxides

ECS Proceedings Volumes ◽

10.1149/200307.0372pv ◽

2003 ◽

Vol 2003-07 (1) ◽

pp. 372-378 ◽

Cited By ~ 2

Author(s):

Sophie Beaudet Savignat

Keyword(s):

Rare Earth ◽

Ionic Conduction ◽

Rare Earth Oxides ◽

Apatite Type

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Crystal structure of apatite type Ca2.49Nd7.51(SiO4)6O1.75

Acta Crystallographica Section E Crystallographic Communications ◽

10.1107/s205698901600089x ◽

2016 ◽

Vol 72 (2) ◽

pp. 209-211 ◽

Cited By ~ 3

Author(s):

Thu Hoai Le ◽

Neil R. Brooks ◽

Koen Binnemans ◽

Bart Blanpain ◽

Muxing Guo ◽

...

Keyword(s):

Crystal Structure ◽

Single Crystal ◽

Room Temperature ◽

Solubility Limit ◽

Temperature Data ◽

X Ray Diffraction ◽

Slow Cooling ◽

X Ray ◽

Natural Apatite ◽

Apatite Type

The title compound, Ca2+xNd8–x(SiO4)6O2–0.5x(x= 0.49), was synthesized at 1873 K and rapidly quenched to room temperature. Its structure has been determined using single-crystal X-ray diffraction and compared with results reported using neutron and X-ray powder diffraction from samples prepared by slow cooling. The single-crystal structure from room temperature data was found to belong to the space groupP63/mand has the composition Ca2.49Nd7.51(SiO4)6O1.75[dicalcium octaneodymium hexakis(orthosilicate) dioxide], being isotypic with natural apatite and the previously reported Ca2Nd8(SiO4)6O2and Ca2.2Nd7.8(SiO4)6O1.9. The solubility limit of calcium in the equilibrium state at 1873 K was found to occur at a composition of Ca2+xNd8–x(SiO4)6O2–0.5x, wherex= 0.49.

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