Polarisation behaviour of calcium phosphate based ceramics

J P Gittings; Christopher R Bowen; Irene G Turner; Frances R Baxter; Julian B Chaudhuri

Polarisation behaviour of calcium phosphate based ceramics

J P Gittings, Christopher R Bowen, Irene G Turner, Frances R Baxter, Julian B Chaudhuri

Research output: Chapter or section in a book/report/conference proceeding › Chapter or section

25 Citations (SciVal)

Abstract

This paper studies the effects of porosity, sintering atmosphere and composition on the polarisation behaviour of calcium phosphate (CaP) ceramics. Hydroxyapatite (HA) and atricalcium phosphate (α-TCP) materials were prepared as both dense discs and as porous samples with interconnecting porosity. Materials were sintered in either air or water vapour at 13000C and poled at a variety of temperatures, applied electric fields and time periods to optimise the polarisation properties of the materials. Thermally Stimulated Depolarisation Current (TSDC) measurements were used to investigate the degree of polarisation of the HA and a-TCP ceramics. A high depolarisation current was observed for both the porous HA and α-TCP ceramics. Sintering in water vapour also increased the depolarisation current due to reduced dehydration reactions, which result in a greater concentration of hydroxyl ions.

Original language	English
Title of host publication	Advanced Materials Forum IV: Materiais 2007
Editors	A Torres Marques, A F Silva, A P M Baptista, C Sá, F J L Alves, L F Malheiros, M Vieira
Place of Publication	Zurich
Publisher	Trans Tech Publications
Pages	91-95
Number of pages	5
ISBN (Print)	978-0-87849-373-9
Publication status	Published - 2008
Event	Advanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM - Porto, Portugal Duration: 1 Apr 2007 → 4 Apr 2007

Conference

Conference	Advanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM
Country/Territory	Portugal
City	Porto
Period	1/04/07 → 4/04/07

Bibliographical note

Selected, peer reviewed papers from the IV International Materials Symposium Materiais 2007 and XIII Encontro da Sociedade Portuguesa de Materiais – SPM, Faculdade de Engenharia da Universidade do Porto, April 1-4, Porto, Portugal, 2007

Keywords

Dehydration reactions
Polarisation behaviours
Sintering atmospheres
Hydroxyl ions
Porous samples
Degree of polarisation
Concentration of
Water vapours
Applied electric fields
Time periods
Depolarisation
Polarisation

FUNCTIONAL BIOCERAMIC COMPOSITES FOR ENHANCED AND CONTROLLED BONE GROWTH IN BIOMEDICAL AND TISSUE ENGINEERING APPLICATIO
Bowen, C. (PI), Chaudhuri, J. (CoI) & Turner, I. (CoI)
Engineering and Physical Sciences Research Council
1/10/05 → 30/09/08
Project: Research council

Cite this

Polarisation behaviour of calcium phosphate based ceramics. / Gittings, J P; Bowen, Christopher R; Turner, Irene G et al.
Advanced Materials Forum IV: Materiais 2007. ed. / A Torres Marques; A F Silva; A P M Baptista; C Sá; F J L Alves; L F Malheiros; M Vieira. Zurich: Trans Tech Publications, 2008. p. 91-95.

Research output: Chapter or section in a book/report/conference proceeding › Chapter or section

Gittings, JP, Bowen, CR, Turner, IG, Baxter, FR & Chaudhuri, JB 2008, Polarisation behaviour of calcium phosphate based ceramics. in AT Marques, AF Silva, APM Baptista, C Sá, FJL Alves, LF Malheiros & M Vieira (eds), Advanced Materials Forum IV: Materiais 2007. Trans Tech Publications, Zurich, pp. 91-95, Advanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM, Porto, Portugal, 1/04/07.

@inbook{8dbdce9a4f354f73b03aee39fd977624,

title = "Polarisation behaviour of calcium phosphate based ceramics",

abstract = "This paper studies the effects of porosity, sintering atmosphere and composition on the polarisation behaviour of calcium phosphate (CaP) ceramics. Hydroxyapatite (HA) and atricalcium phosphate (α-TCP) materials were prepared as both dense discs and as porous samples with interconnecting porosity. Materials were sintered in either air or water vapour at 13000C and poled at a variety of temperatures, applied electric fields and time periods to optimise the polarisation properties of the materials. Thermally Stimulated Depolarisation Current (TSDC) measurements were used to investigate the degree of polarisation of the HA and a-TCP ceramics. A high depolarisation current was observed for both the porous HA and α-TCP ceramics. Sintering in water vapour also increased the depolarisation current due to reduced dehydration reactions, which result in a greater concentration of hydroxyl ions.",

keywords = "Dehydration reactions, Polarisation behaviours, Sintering atmospheres, Hydroxyl ions, Porous samples, Degree of polarisation, Concentration of, Water vapours, Applied electric fields, Time periods, Depolarisation, Polarisation",

author = "Gittings, {J P} and Bowen, {Christopher R} and Turner, {Irene G} and Baxter, {Frances R} and Chaudhuri, {Julian B}",

note = "Selected, peer reviewed papers from the IV International Materials Symposium Materiais 2007 and XIII Encontro da Sociedade Portuguesa de Materiais – SPM, Faculdade de Engenharia da Universidade do Porto, April 1-4, Porto, Portugal, 2007; Advanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM ; Conference date: 01-04-2007 Through 04-04-2007",

year = "2008",

language = "English",

isbn = "978-0-87849-373-9",

pages = "91--95",

editor = "Marques, {A Torres} and Silva, {A F} and Baptista, {A P M} and C S{\'a} and Alves, {F J L} and Malheiros, {L F} and M Vieira",

booktitle = "Advanced Materials Forum IV: Materiais 2007",

publisher = "Trans Tech Publications",

address = "Germany",

}

TY - CHAP

T1 - Polarisation behaviour of calcium phosphate based ceramics

AU - Gittings, J P

AU - Bowen, Christopher R

AU - Turner, Irene G

AU - Baxter, Frances R

AU - Chaudhuri, Julian B

N1 - Selected, peer reviewed papers from the IV International Materials Symposium Materiais 2007 and XIII Encontro da Sociedade Portuguesa de Materiais – SPM, Faculdade de Engenharia da Universidade do Porto, April 1-4, Porto, Portugal, 2007

PY - 2008

Y1 - 2008

N2 - This paper studies the effects of porosity, sintering atmosphere and composition on the polarisation behaviour of calcium phosphate (CaP) ceramics. Hydroxyapatite (HA) and atricalcium phosphate (α-TCP) materials were prepared as both dense discs and as porous samples with interconnecting porosity. Materials were sintered in either air or water vapour at 13000C and poled at a variety of temperatures, applied electric fields and time periods to optimise the polarisation properties of the materials. Thermally Stimulated Depolarisation Current (TSDC) measurements were used to investigate the degree of polarisation of the HA and a-TCP ceramics. A high depolarisation current was observed for both the porous HA and α-TCP ceramics. Sintering in water vapour also increased the depolarisation current due to reduced dehydration reactions, which result in a greater concentration of hydroxyl ions.

AB - This paper studies the effects of porosity, sintering atmosphere and composition on the polarisation behaviour of calcium phosphate (CaP) ceramics. Hydroxyapatite (HA) and atricalcium phosphate (α-TCP) materials were prepared as both dense discs and as porous samples with interconnecting porosity. Materials were sintered in either air or water vapour at 13000C and poled at a variety of temperatures, applied electric fields and time periods to optimise the polarisation properties of the materials. Thermally Stimulated Depolarisation Current (TSDC) measurements were used to investigate the degree of polarisation of the HA and a-TCP ceramics. A high depolarisation current was observed for both the porous HA and α-TCP ceramics. Sintering in water vapour also increased the depolarisation current due to reduced dehydration reactions, which result in a greater concentration of hydroxyl ions.

KW - Dehydration reactions

KW - Polarisation behaviours

KW - Sintering atmospheres

KW - Hydroxyl ions

KW - Porous samples

KW - Degree of polarisation

KW - Concentration of

KW - Water vapours

KW - Applied electric fields

KW - Time periods

KW - Depolarisation

KW - Polarisation

M3 - Chapter or section

SN - 978-0-87849-373-9

SP - 91

EP - 95

BT - Advanced Materials Forum IV: Materiais 2007

A2 - Marques, A Torres

A2 - Silva, A F

A2 - Baptista, A P M

A2 - Sá, C

A2 - Alves, F J L

A2 - Malheiros, L F

A2 - Vieira, M

PB - Trans Tech Publications

CY - Zurich

T2 - Advanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM

Y2 - 1 April 2007 through 4 April 2007

ER -

Polarisation behaviour of calcium phosphate based ceramics

Abstract

Conference

Bibliographical note

Keywords

Fingerprint

Projects

FUNCTIONAL BIOCERAMIC COMPOSITES FOR ENHANCED AND CONTROLLED BONE GROWTH IN BIOMEDICAL AND TISSUE ENGINEERING APPLICATIO

Cite this