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Gallium phosphide (GaP), a phosphide of gallium, is a compound semiconductor material with an indirect band gap of 2.24 eV at room temperature. Impure polycrystalline material has the appearance of pale orange or grayish pieces. Undoped single crystals are orange, but strongly doped wafers appear darker due to free-carrier absorption. It is odorless and insoluble in water.
GaP has a microhardness of 9450 N/mm2, a Debye temperature of 446 K (173 °C), and a thermal expansion coefficient of 5.3 ×10−6 K−1 at room temperature. Sulfur, silicon or tellurium are used as dopants to produce n-type semiconductors. Zinc is used as a dopant for the p-type semiconductor.
Gallium phosphide has applications in optical systems. Its static dielectric constant is 11.1 at room temperature. Its refractive index varies between ~3.2 and 5.0 across the visible range, which is higher than in most other semiconducting materials. In its transparent range, its index is higher than almost any other transparent material, including gemstones such as diamond, or non-oxide lenses such as zinc sulfide.

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  1. S

    corner and perimeter gap

    what is the recommended gap that should be left between the tiles that meet at internal corners on the walls? Also what gap should be left around the floor perimeter. Perimeter gap would be covered by the bottom wall tile. tiles are 12mm thick porcelain. 1200X600
  2. D

    Tile expansion gap

    Hi guys, I'm tiling a large floor area 30 square meters (rectangle shape room) using 600x600 porcelain floor tiles and leaving 3mm grout joints. I understand that I need to leave un-grouted expansion gaps around perimeter of the room and also understand that I need to leave un-grouted expansion...
    • Deleted member 57709
    • Thread
    • expansion gap tile
    • Replies: 9
    • Forum: America Tile Forum
  3. T

    Do you need to run Ditra right to the edge of the room? Thinking of leaving a gap to deal with a high perimeter.

    I've got a room with a two-layer plywood subfloor that is fairly flat (not level) but the floor ramps up at the perimeter fairly sharply. I'm going to be using Ditra for the installation (only for uncoupling - not worried about waterproofing). Rather than trying to raise the entire floor to...
  4. M

    Prepare large gap before tiling

    Hi, I've got a large gap behind the radiator in the bathroom where the tiles and plasterboard were removed to change the pipe layout. I am wanting to now fix the gap and retilw the area, but am not sure of how to fix the hole correctly without causing a lot of extra work. Hopefully the picture...
  5. B

    Tile to ceiling gap

    Hi all! As mentioned previously I’m new to the game! I’m tiling our en-suite but I’ve dropped a bit of a ball on my working out.. and no left with a 8-10mm gap between tiles and upvc ceiling cladding (see pic). Whats the best thing to fill the gap with? I was thinking a small upvc quadrant or...
  6. O

    Is a gap needed between shower tray and wall tiles?

    I'm sorry to be asking more questions, but I'm quite worried about my current tiler's work. After further inspecting his progress I note that the wall tiles are installed hard down onto the shower tray most of the way around the tray. Shouldn't there be at least a 2 mm gap between the tray and...
    • Oddbod
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    • Replies: 6
    • Forum: Tanking and Wetrooms
  7. J

    Tiles against brick edging – expansion gap?

    Hi all, new signup here beginning first tiling job. We've got a conservatory room at the back of our house in which we're laying some quarry tile. We've figured out the spacing, and happily the room is pretty square (3mm skew for just under 4m), so we're beginning our layout on the left hand...
  8. J

    Tile Trim, No Grout Gap..... And A Rant To Finish

    Ok I am fitting the tile trim L shaped aluminium profile around the window, Dave you are right, no grout gap against the tile looks better. I did put a bit of coloured silicone between just to seal the gap and it looks good, But do I have a grout gap in the reveal up against the tile trim ? I...
  9. D

    Tiler mistake - large gap between tiles and ceiling

    Hi all Having a bit of a mare; after having my last shower installation botched (but thankfully getting my money back after threatening to make a court claim), I've had another botch job with fitter #2! After the tiling was done there was a gap of about one inch between the tiles and ceiling...
  10. Bopster

    Expansion gap

    I'm going to be tiling a conservatory floor which has wet ufh. 3 walls are metal frame of conservatory other wall is a combination of skirting board, expansion joint to tiled floor. My question is on the 3 metal walls how much room do I leave for expansion? I'll be using colour matched silicon...
  11. A

    Gap on plywood butt joint

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  12. F

    How to fill gap between floor tiles and shower

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    • Ferneya75
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    • Replies: 3
    • Forum: Tanking and Wetrooms
  13. O

    Help - What to do with a small gap?

    I am going to tile my kitchen tomorrow and have laid out some tiles tonight, to get an idea. I have an issue with the window sill. 2 whole tiles leave approx an inch gap before the window frame. What is the best solution to this issue? I am assuming cutting under an inch of tile to fill the gap...
  14. R

    How to fill gap between tiles and worktop?

    Hi, I’ve tiled my kitchen but went with the wrong line so there is a gap between the bottom of the tiles and the kitchen worktop. I think it is too large to fill neatly with silicone. Any other ideas? There is an internal corner strip from wickes that I’ve used behind the sink but I’d have to...
  15. S

    Gap floor tile to wall

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  16. J

    Large gap between bath and wall

    I have about a 40mm gap between the bath edge and the wall, I plan to tile the wall, do you recommend boxing this in or using some kind of sealant? Really struggling to find a large enough ceramic or plastic lip edge to fit.
  17. P

    Fitting shower screen to wall above tile sloping to bath edge leaves a gap

    Hello Tilers I recently fitted a bathroom for a (paying) friend. One of the problems I encountered was the soil pipe which runs behind, then turns to run along the tap end of the bath. I made up the gap with 76 x 51 mm (3''x 2'') CLS, I tiled it forming a slope to shed water, grouted and then...
    • Paluro
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    • bath edge fitting former gap screen shower shower tray tile wall wetroom
    • Replies: 2
    • Forum: Tanking and Wetrooms
  18. magicmat

    Advice on how to tile over a gap

    Hi everyone, We have just finished renovating our home and have saved the entry porch as a job for us to do. We would like to have a practise with tiling as its a small simple shape. We have not tiled before. There is just a little problem that i'm not sure how to solve. The entry porch has a...
    • magicmat
    • Thread
    • advice door frame gap how how to tile over threshold tile
    • Replies: 1
    • Forum: DIY Tiling Forum
  19. J

    What’s the best tiling gap? 2-3-4mm etc

    Hi, Second post. How do you decide what’s the best spacing gap between tiles? I plan on setting 200 x 500 x 8.5mm wall tiles and unsure of what spacers to set between these. Any advice appreciated
  20. T

    TAKING UP GAP WHEN TILING

    Can anyone advise me on best course of action. A bath tub has been fitted and secured in place. It is solid and isn't going anywhere. I've been asked to tile the walls, obviously coming down on top of the tub. The corner isn't square and as a result a 10mm gap has been left. Can this be taken up...
Posting a tiling question to the forum? Post in Tilers' Talk if you are unsure which forum to post in. We'll move it if there's a more suitable forum.

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