Event Title
Isomorphous Replacement Ca by Rare-Earth Elements in Structure of Vanadate Apatite
Location
CSU Ballroom
Start Date
21-4-2008 1:00 PM
End Date
21-4-2008 3:00 PM
Student's Major
Chemistry and Geology
Student's College
Science, Engineering and Technology
Mentor's Name
Lyudmyla Ardanova
Mentor's Department
Chemistry and Geology
Mentor's College
Science, Engineering and Technology
Description
Compounds with the structure of apatite, and hydroxyapatite among them, have wide application as artificial biomaterials compatible with a bone tissue, luminophor materials, sensor controls for water and alcohols, absorbents of ecologically harmful and radioactive substances (Pb, Cd, F, U, Sr), catalysts. In many respects such wide spectrum of application is caused by the ability of apatite to undergo isomorphous substitution of other ions for Ca, P and OH groups. The possibility of modifying synthetic apatites in order to produce materials possessing important properties has long been considered with studying isomorphous substitutions in structure of hydroxophosphates Ca5(P04)30H. Natural vanadates with an analogous structure form a very small family that includes only a few minerals. Unlike hydroxophosphates, the hydroxovanadates with the apatite structures remained insufficiently studied. The main promise of hydroxovanadate apatites is due to their potential applications as efficient luminescent and laser materials and catalysts. Using XR-powder diffraction we investigated the possibility for heterovalent isomorphous substitutions in 3hydroxyafatite Ca5(V04)30H under the scheme: Ca2+ +OH- M3+ + 02- (where M 3+ are rare earth ion: Sm 3+ , Ho 3+). Current work was proceeding along three lines:
1) Determination of phase composition and compositional limit of solid solutions of composition Ca(5-x)Me3+x(V04)30H1 -xOx (where Me3+= Sm3+, Ho3+).
2) Determination of unit cell parameter changes for apatite of composition Ca(5-x)Me3+ x(V04)30H1-x0x (where Me 3+ = Sm3+, Ho3+) as mole fraction of rare earth ions increases.
3) IR spectroscopy of the single phase samples will be conducted to confirm a scheme of substitution: Ca2+ + OH- 02-+ M3+.
Isomorphous Replacement Ca by Rare-Earth Elements in Structure of Vanadate Apatite
CSU Ballroom
Compounds with the structure of apatite, and hydroxyapatite among them, have wide application as artificial biomaterials compatible with a bone tissue, luminophor materials, sensor controls for water and alcohols, absorbents of ecologically harmful and radioactive substances (Pb, Cd, F, U, Sr), catalysts. In many respects such wide spectrum of application is caused by the ability of apatite to undergo isomorphous substitution of other ions for Ca, P and OH groups. The possibility of modifying synthetic apatites in order to produce materials possessing important properties has long been considered with studying isomorphous substitutions in structure of hydroxophosphates Ca5(P04)30H. Natural vanadates with an analogous structure form a very small family that includes only a few minerals. Unlike hydroxophosphates, the hydroxovanadates with the apatite structures remained insufficiently studied. The main promise of hydroxovanadate apatites is due to their potential applications as efficient luminescent and laser materials and catalysts. Using XR-powder diffraction we investigated the possibility for heterovalent isomorphous substitutions in 3hydroxyafatite Ca5(V04)30H under the scheme: Ca2+ +OH- M3+ + 02- (where M 3+ are rare earth ion: Sm 3+ , Ho 3+). Current work was proceeding along three lines:
1) Determination of phase composition and compositional limit of solid solutions of composition Ca(5-x)Me3+x(V04)30H1 -xOx (where Me3+= Sm3+, Ho3+).
2) Determination of unit cell parameter changes for apatite of composition Ca(5-x)Me3+ x(V04)30H1-x0x (where Me 3+ = Sm3+, Ho3+) as mole fraction of rare earth ions increases.
3) IR spectroscopy of the single phase samples will be conducted to confirm a scheme of substitution: Ca2+ + OH- 02-+ M3+.
Recommended Citation
Gerbensky, Susan. "Isomorphous Replacement Ca by Rare-Earth Elements in Structure of Vanadate Apatite." Undergraduate Research Symposium, Mankato, MN, April 21, 2008.
https://cornerstone.lib.mnsu.edu/urs/2008/poster-session-B/26
