Complete Substitution of Calcium by Lanthanum (III) in Synethetic Calcium Vanadate Apatite
Location
CSU Ballroom
Start Date
16-4-2013 10:00 AM
End Date
16-4-2013 12:00 PM
Student's Major
Chemistry and Geology
Student's College
Science, Engineering and Technology
Mentor's Name
Lyudmyla Stackpool
Mentor's Department
Chemistry and Geology
Mentor's College
Science, Engineering and Technology
Description
Apatites form a large group of solid isomorphs with the general formula M5(EO4)3X where M was univalent to trivalent cations (Ca, Sr, Ba, Cd, Eu, La, Na, K, and others); E was tetravalent to hexavalent cations (P, V, As, Si, Ge, S, Cr, and others); and X represented anions (OH-, F-, Cl-, Br-, I-, and O-2). Apatite compounds are widely studied due to the possibility of their use as biomaterials [1], catalysts [2], luminescent materials [3], and ionic conductors [4]. Calcium oxovanadate apatite Ca10-xLax(VO4)6o1-x/2O1+x/2 modified by lanthanum is the only one whose electrical properties are described in literature. As shown in [5] oxygen vacancies make oxide-ion conductivity possible along the c axis of the hexagonal matrix. The electric conductivity of lanthanum hydroxovanadates Ca5-xLax(VO4)3(OH)1-xOx modified by REE (rare earth elements) has not been studied yet. However,
it was shown in [6] that the electrical conductivity may grow more than an order of magnitude due to heterovalent substitutions in the apatite structure. In this work we have studied the isomorphic substitution of La3+ for Ca2+ in hydroxovanadate with apatite structure under the scheme: Ca2+ + OH-
--- La3+ + O2- in order to refine the limits of isomorphic substitutions which were reported earlier [7] as 0
Complete Substitution of Calcium by Lanthanum (III) in Synethetic Calcium Vanadate Apatite
CSU Ballroom
Apatites form a large group of solid isomorphs with the general formula M5(EO4)3X where M was univalent to trivalent cations (Ca, Sr, Ba, Cd, Eu, La, Na, K, and others); E was tetravalent to hexavalent cations (P, V, As, Si, Ge, S, Cr, and others); and X represented anions (OH-, F-, Cl-, Br-, I-, and O-2). Apatite compounds are widely studied due to the possibility of their use as biomaterials [1], catalysts [2], luminescent materials [3], and ionic conductors [4]. Calcium oxovanadate apatite Ca10-xLax(VO4)6o1-x/2O1+x/2 modified by lanthanum is the only one whose electrical properties are described in literature. As shown in [5] oxygen vacancies make oxide-ion conductivity possible along the c axis of the hexagonal matrix. The electric conductivity of lanthanum hydroxovanadates Ca5-xLax(VO4)3(OH)1-xOx modified by REE (rare earth elements) has not been studied yet. However,
it was shown in [6] that the electrical conductivity may grow more than an order of magnitude due to heterovalent substitutions in the apatite structure. In this work we have studied the isomorphic substitution of La3+ for Ca2+ in hydroxovanadate with apatite structure under the scheme: Ca2+ + OH-
--- La3+ + O2- in order to refine the limits of isomorphic substitutions which were reported earlier [7] as 0
Recommended Citation
Deragisch, Hilary and Nicole Stenzel. "Complete Substitution of Calcium by Lanthanum (III) in Synethetic Calcium Vanadate Apatite." Undergraduate Research Symposium, Mankato, MN, April 16, 2013.
https://cornerstone.lib.mnsu.edu/urs/2013/poster-session-A/31
