Electrical Properties of Annealed and Coated Boron Nitride under Electron Beam Irradiation

17 Pages·2016·2.35 MB·English

UUttaahh SSttaattee UUnniivveerrssiittyy
DDiiggiittaallCCoommmmoonnss@@UUSSUU
Presentations Materials Physics
Summer 6-2015
EElleeccttrriiccaall PPrrooppeerrttiieess ooff AAnnnneeaalleedd aanndd CCooaatteedd BBoorroonn NNiittrriiddee uunnddeerr
EElleeccttrroonn BBeeaamm IIrrrraaddiiaattiioonn
Kevin Guerch
Thierry Paulmier
JR Dennison
Utah State Univesity
Justin Dekany
Sophia Guillemet-Fritsch
Pascal Lenormand
Follow this and additional works at: https://digitalcommons.usu.edu/mp_presentations
Part of the Condensed Matter Physics Commons
RReeccoommmmeennddeedd CCiittaattiioonn
Guerch, Kevin; Paulmier, Thierry; Dennison, JR; Dekany, Justin; Guillemet-Fritsch, Sophia; and Lenormand,
Pascal, "Electrical Properties of Annealed and Coated Boron Nitride under Electron Beam Irradiation"
(2015). Proceedings of the 13th International Symposium on Materials in the Space Environment.
Presentations. Paper 118.
https://digitalcommons.usu.edu/mp_presentations/118
This Presentation is brought to you for free and open
access by the Materials Physics at
DigitalCommons@USU. It has been accepted for
inclusion in Presentations by an authorized administrator
of DigitalCommons@USU. For more information, please
contact [email protected].
Electrical properties of annealed and coated boron nitride
study under electron beam irradiation
K. Guerch (1,2,3), T. Paulmier(1), JR Dennison(2), J. Dekany(2), S. Guillemet-Fritsch(3),
P. Lenormand(3)
(1) ONERA, The French Aerospace Lab, F-31055, France
(2)Materials Physics Group, Physics Department, Utah State University, Logan, UT –United States
(3)Institut Carnot CIRIMAT (CNRS), UMR 5085, Université Paul Sabatier, 118 route de Narbonne 31062 Toulouse Cedex 9 – France
13th International Symposium on Materials in the Space Environment (ISMSE-13)
22 - 26 June 2015 – Pau, France
Context & motivation 1/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
Context
Insulator materials such as boron nitride
(BN) are exposed to electron radiation
during the operation of THALES’s
electronic application
e-
p e-
p
Issue
e-
p
Electron  Charging of BN under irradiation
implantation
The application efficiency decreases
! - - - - - - - - -  Alumina coating on BN to limit charging
Al O - - - - - - - - - Properties degrade over time
2 3
BN substrate
Motivation
Electronic application (THALES)
Spacecraft
 Identify the physical mechanisms of
charging and degradation in materials
 Optimise the electrical properties of
ceramics to limit these phenomena
ELECTROCERAMICS XIV,Bucharest –June 16,2014
Outlines 2/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
 Scientific approach
 Experimentation
Charging study of annealed and coated

BN
 Aging study of annealed BN/Al O
2 3
 Conclusion & outlooks
ELECTROCERAMICS XIV,Bucharest –June 16,2014 2014 -MPG (USU) / ONERA
Luminescence of BN under electron irradiation
 Scientific approach 3/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
-
Charging study of new industrial samples Aging study of the annealed BN/Al O
2 3
Parametric study under electron beam : Under critical electron irradiation :
 Energy  BN substrate
 High flux
 Flux  Alumina coating  High dose
 Long time
 Temperature  Annealing treatment
Dark conductivity study of the industrial ceramics
Secondary
Incident electrons electron emission
( )
SEE
Surface
300 nm conductivity
Al O
2 3 ( )
surf
BN Volume
conductivity
ELECTROCERAMICS XIV,Bucharest –June 16,2014 ( )
vol
 Experimentation 4/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
CEDRE facility and method
PC : control
Study the charging and relaxation kinetics and the & acquisition
Video recorder
aging in representative conditions
Voltmeter
Air
Vacuum
 Secondary vacuum (P ~ 5 10-7 hPa) Kelvin Probe
5·10-7hPa
(KP)
 20 °C < T < 400 °C
 Electron gun : 1 keV < E < 20 keV
i
50 pA.cm-2 < J < 100 µA.cm-2
i
Ceramic
heating
Electron gun
element
(E < 20 keV)
i
T 400 °C Round trip duration : 50 s
max
Interception of beam: 20 sec
Surface potential (V ) measurement with an
s
electrostatic probe (Kelvin Probe – KP)
Sample
ELECTROCERAMICS XIV,Bucharest –June 16,2014
 Experimentation 5/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
CVC chamber and method
Study the dark conductivity in representative
conditions
 Secondary vacuum (P ~ 1 10-5 hPa)
 -150 °C < T < 200 °C
Constant Voltage Conductivity (CVC) method[1] –
70 V < V < 470 V
I(t) > 10-16 A
𝑰(𝒕)× 𝒅
𝝈𝑪𝑽𝑪(𝒕) =
𝑺 × 𝑽
ELECTROCERAMICS XIV,Bucharest –June 16,2014
[1] J. Brunson, «Hopping Conductivity and Charge Transport in Low Density Polyethylene», PhD Thesis, Utah State University, Logan,UT, USA, 2010.
 Charging study of annealed and coated BN 6/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
Irradiation phase
Aim: Identify the influence of coating and thermal treatments on the surface potential regulation of BN
3 configurations of unused industrial ceramics:
 Boron nitride substrate - BN
 BN with alumina coating - BN/Al O
2 3
 Annealed BN/Al O - an–BN/Al O
2 3 2 3
Incident electrons with
different energies
300 nm 5 keV
Al O
2 3
6.4 keV
8 keV
11 keV
The energy for a penetration length of 300 nm in
BN Al O is  6.4 keV (Monte-Carlo simulations)
2 3
ELECTROCERAMICS XIV,Bucharest –June 16,2014
 Charging study of annealed and coated BN 7/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
Irradiation phase
E (kV)
0 Incident electrons
0 5 10 15
J = 10 nA.cm-2, defocused beam
0 i
an–BN/Al O
-500 2 3
n
im -1000 300 nm 5 keV
01 BN/Al O Al2O3
= 2 3
-1500 8 keV
trri
,)
V
( -2000
q
e
Vs BN 11 keV
-2500
10 nA.cm-2,
-3000 Defocused beam, BN
T °C
room
-3500
E = 5 keV (non-penetrating beam for the coating) : No charging in coated BN samples
i
E  8 keV : Critical and low charging in BN and coated BN, respectively but the V is limited in an-BN/Al O
i s 2 3
The alumina coating decreases the surface potential through its higher  [2] than that of BN[3][4]
SEE
The annealing treatment under vacuum limits the V :
s
 Defects generation has been determined which may increase the conduction mechanisms
 Hypothesis: decrease of the critical threshold of surface discharges
[2] P. H. Dawson, «Secondary Electron Emission Yields of some Ceramics», J. Appl. Phys., vol. 37, no 9, p. 3644, 1966
[3E] LL.E GC. SThRerOstnCyoEvRetA AMl., IRCepSorXt oIfV th,eB Muocschowa rEensertge–ticJ Iunsntietut1e,6 (,872) 0N1°468091701, 1969.
[4] B. V. Prokofiev, «PyrolyticalBoron Nitride as a Window Material for High Power Microwave Electron Devices», IEEE, 2010
 Charging study of annealed and coated BN 8/13
Charging study of annealed
Scientific approach Experimentation  Aging study of an–BN/AlO Conclusion & outlooks
and coated boron nitride 2 3
Relaxation phase
E (kV)
0
0 5 10 15 𝑽 𝑸
1 𝑽𝒏𝒐𝒓𝒎 = 𝒔(𝟏𝟎) ≡ 𝒔(𝟏𝟎)
BN 𝒔(𝟏𝟎𝒎𝒊𝒏) 𝑽 𝑸
𝒔(𝟎) 𝒔(𝟎)
0.9
0.8
n BN/Al O
im 2 3
0.7
01 After Ei = 5 keV : Charge relaxation from alumina coating and
= 0.6
xa especially in the annealed one
tler 0.5
,)
V 0.4
(
m
ron 0.3
Vs After E  8 keV : Low relaxation rates even though some
i
0.2
charges are evacuated in the annealed sample
0.1 T °C
an–BN/Al O room
2 3
0
Intrinsic conductivities of industrial samples determined through CVC method
BN BN/Al O an–BN/Al O
2 3 2 3
(0,5 ± 0,1).10-15 S.m-1 (0,2 ± 0,1).10-15 S.m-1 (8 ± 1).10-15 S.m-1
The annealing treatment increases the total conductivity (by 25 – 30)
ELECTROCERAMICS XIV,Bucharest –June 16,2014