Event Title

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

This document is currently not available here.

Share

COinS
 
Apr 16th, 10:00 AM Apr 16th, 12:00 PM

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.
http://cornerstone.lib.mnsu.edu/urs/2013/poster-session-A/31