Template parse errors: 'mat-icon' is not a known element

I'm working with Angular CLI and angular material v.5.2.5 and trying to use

mat-icon-button
​

but such an error produced by the console:

Uncaught Error: Template parse errors: 'mat-icon' is not a known element...
​

if I use

mat-raised-button
​

everything works fine cannot figure out how to solve that

index.html

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Todo</title>
<base href="/">

<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700,400italic"
rel="stylesheet">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
</head>
<body>
<app-root></app-root>
</body>
</html>


main.ts

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
enableProdMode();
}

platformBrowserDynamic().bootstrapModule(AppModule)
.catch(err => console.log(err));


app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { MatButtonModule } from '@angular/material/button';


import { AppComponent } from './app.component';


@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
FormsModule,
HttpModule,
MatButtonModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }

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